10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 2017

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                      to                     

Commission File Number: 001-14649

Trex Company, Inc.

(Exact name of registrant as specified in its charter)

Delaware	54-1910453
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

160 Exeter Drive Winchester, Virginia	22603-8605
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code: (540) 542-6300

Not Applicable

(Former name, former address and former fiscal year, if changed since last report)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ☒    No  ☐

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  ☒    No  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.:

Large accelerated filer	☒	Accelerated filer	☐
Non-accelerated filer	☐	Smaller reporting company	☐
Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act  ☐

Indicate by check mark whether the registrant is a shell company (as defined by Rule 12b-2 of the Exchange Act):    Yes  ☐    No  ☒

The number of shares of the registrant’s common stock, par value $.01 per share, outstanding at April 21, 2017 was 29,401,727 shares.

TREX COMPANY, INC.

INDEX

		Page
PART I FINANCIAL INFORMATION			2
Item 1.	Financial Statements		2
Condensed Consolidated Statements of Comprehensive Income for the Three Months Ended March 31, 2017 and March 31, 2016 (unaudited)			2
Condensed Consolidated Balance Sheets as of March 31, 2017 (unaudited) and December 31, 2016			3
Condensed Consolidated Statements of Cash Flows for the Three Months Ended March 31, 2017 and March 31, 2016 (unaudited)			4
Notes to Condensed Consolidated Financial Statements (unaudited)			5
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations		13
Item 3.	Quantitative and Qualitative Disclosures About Market Risk		19
Item 4.	Controls and Procedures		19
PART II OTHER INFORMATION			20
Item 1.	Legal Proceedings		20
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds		20
Item 5.	Other Information		20
Item 6.	Exhibits		22

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PART I

FINANCIAL INFORMATION

Item 1. Financial Statements

TREX COMPANY, INC.

Condensed Consolidated Statements of Comprehensive Income

(Unaudited)

(In thousands, except share and per share data)

	Three Months Ended March 31,
	2017		2016
Net sales	$	144,806	$	131,676
Cost of sales		79,637		74,049
Gross profit		65,169		57,627
Selling, general and administrative expenses		23,269		20,612
Income from operations		41,900		37,015
Interest expense, net		204		572
Income before income taxes		41,696		36,443
Provision for income taxes		13,747		12,737
Net income	$	27,949	$	23,706
Basic earnings per common share	$	0.95	$	0.80
Basic weighted average common shares outstanding		29,363,210		29,697,722
Diluted earnings per common share	$	0.95	$	0.79
Diluted weighted average common shares outstanding		29,561,406		29,910,292
Comprehensive income	$	27,949	$	23,706

See Notes to Condensed Consolidated Financial Statements (Unaudited).

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TREX COMPANY, INC.

Condensed Consolidated Balance Sheets

(In thousands)

	March 31, 2017			December 31, 2016
	(Unaudited)
Assets
Current assets:
Cash and cash equivalents	$	1,767		$	18,664
Accounts receivable, net		171,288			48,039
Inventories		30,109			28,546
Prepaid expenses and other assets		4,071			10,400
Total current assets		207,235			105,649
Property, plant and equipment, net		103,608			103,286
Goodwill and other intangibles		10,523			10,523
Other assets		1,940			1,972
Total assets	$	323,306		$	221,430
Liabilities and Stockholders’ Equity
Current liabilities:
Accounts payable	$	13,643		$	10,767
Accrued expenses and other liabilities		31,108			34,693
Accrued warranty		5,925			5,925
Line of credit		77,000			—
Total current liabilities		127,676			51,385
Deferred income taxes		894			894
Non-current accrued warranty		30,757			31,767
Other long-term liabilities		3,045			3,223
Total liabilities		162,372			87,269
Commitments and contingencies		—			—
Stockholders’ equity:
Preferred stock, $0.01 par value, 3,000,000 shares authorized; none issued and outstanding		—			—
Common stock, $0.01 par value, 80,000,000 shares authorized; 34,895,162 and 34,894,233 shares issued and 29,401,481 and 29,400,552 shares outstanding at March 31, 2017 and December 31, 2016, respectively		349			349
Additional paid-in capital		118,906			120,082
Retained earnings		215,191			187,242
Treasury stock, at cost, 5,493,681 shares at March 31, 2017 and December 31, 2016		(173,512	)		(173,512	)
Total stockholders’ equity		160,934			134,161
Total liabilities and stockholders’ equity	$	323,306		$	221,430

See Notes to Condensed Consolidated Financial Statements (Unaudited).

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TREX COMPANY, INC.

Condensed Consolidated Statements of Cash Flows

(Unaudited)

(In thousands)

	Three Months Ended March 31,
	2017			2016
Operating Activities
Net income	$	27,949		$	23,706
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization		3,764			3,829
Stock-based compensation		1,965			1,276
Loss (gain) on disposal of property, plant and equipment		258			(105	)
Changes in operating assets and liabilities:
Accounts receivable		(123,249	)		(108,939	)
Inventories		(1,563	)		(2,556	)
Prepaid expenses and other assets		2,304			(1,577	)
Accounts payable		2,876			(666	)
Accrued expenses and other liabilities		(13,939	)		(11,327	)
Income taxes receivable/payable		13,191			12,239
Net cash used in operating activities		(86,444	)		(84,120	)
Investing Activities
Expenditures for property, plant and equipment		(4,312	)		(2,439	)
Proceeds from sales of property, plant and equipment		—			4,249
Net cash (used in) provided by investing activities		(4,312	)		1,810
Financing Activities
Borrowings under line of credit		93,000			148,500
Principal payments under line of credit		(16,000	)		(14,000	)
Repurchases of common stock		(3,244	)		(53,968	)
Financing costs		—			(485	)
Proceeds from employee stock purchase and option plans		103			72
Net cash provided by financing activities		73,859			80,119
Net decrease in cash and cash equivalents		(16,897	)		(2,191	)
Cash and cash equivalents, beginning of period		18,664			5,995
Cash and cash equivalents, end of period	$	1,767		$	3,804
Supplemental Disclosure:
Cash paid for interest	$	64		$	248
Cash paid for income taxes, net	$	556		$	498

See Notes to Condensed Consolidated Financial Statements (Unaudited).

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TREX COMPANY, INC.

Notes to Condensed Consolidated Financial Statements

For the Three Months Ended March 31, 2017 and 2016

(Unaudited)

1. BUSINESS AND ORGANIZATION

Trex Company, Inc. (Company) is the world’s largest manufacturer of wood-alternative decking and railing products, which are marketed under the brand name Trex^®. The Company manufactures and distributes high-performance, low-maintenance wood/plastic composite outdoor living products and related accessories. A majority of its products are manufactured in a proprietary process that combines reclaimed wood fibers and scrap polyethylene. The Company is incorporated in Delaware. The principal executive offices are located at 160 Exeter Drive, Winchester, Virginia 22603, and the telephone number at that address is (540) 542-6300. The Company operates in a single reportable segment.

2. BASIS OF PRESENTATION

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, the accompanying condensed consolidated financial statements do not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements. In the opinion of management, all adjustments (consisting of normal and recurring adjustments except as otherwise described herein) considered necessary for a fair presentation have been included in the accompanying condensed consolidated financial statements. Certain prior period amounts have been reclassified to conform to current period presentation. The consolidated results of operations for the three months ended March 31, 2017 are not necessarily indicative of the results that may be expected for the fiscal year ending December 31, 2017. These condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements as of December 31, 2016 and 2015 and for each of the three years in the period ended December 31, 2016 included in the Annual Report of Trex Company, Inc. on Form 10-K, as filed with the U.S. Securities and Exchange Commission.

The Company’s critical accounting policies are included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016.

3. RECENTLY ADOPTED ACCOUNTING STANDARD

In March 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2016-09, “Compensation – Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting.” The standard amends certain aspects of accounting for employee share-based payment transactions, including the accounting for income taxes related to those transactions and forfeitures. The standard requires recognizing excess tax benefits and deficiencies on share-based awards in the tax provision instead of in equity. Also, the standard requires these amounts to be classified as an operating activity, and shares withheld to satisfy employee taxes to be classified as a financing activity in the statement of cash flows, rather than as currently classified as financing and operating activities, respectively. The standard was effective for annual reporting periods beginning after December 15, 2016 and interim periods within that reporting period, with early adoption permitted. The Company elected to early adopt the standard in fiscal year 2016. The impact of the early adoption resulted in the following:

• The standard requires that excess tax benefits of the settlement or vesting of time-based restricted stock or time-based restricted stock units and performance-based restricted stock or performance-based restricted stock units be recorded within income tax expense. Prior to adoption this amount would have been recorded as an increase in additional paid-in capital. Additionally, the standard requires that excess tax benefits are now reported as an operating activity in the Company’s Consolidated Statements of Cash Flows, rather than as a financing activity as was previously reported. The Company applied this guidance prospectively as of January 1, 2016 during the quarterly period ended December 31, 2016, and, accordingly, data previously reported for the quarterly period ended March 31, 2016 has been adjusted, as follows:

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	Three Months Ended March 31, 2016
	As Reported			Adjusted
	(in thousands, except share and per share data)
Provision for income taxes	$	13,041		$	12,737
Net Income	$	23,402		$	23,706
Basic net income per share	$	0.79		$	0.80
Diluted net income per share	$	0.78		$	0.79
Diluted weighted average common shares outstanding		29,860,730			29,910,292
Cash flows from operating activities	$	(84,483	)	$	(84,120	)
Cash flows from financing activities	$	80,482		$	80,119

• The Company elected to change its policy on accounting for forfeitures and recognize forfeitures as they occur. The Company applied this guidance on a modified retrospective transition method. The Company determined that the cumulative effect of applying the guidance under the modified retrospective transition method was not material to its Consolidated Financial Statements.

• The standard requires the presentation of employee taxes as a financing activity in the Consolidated Statements of Cash Flows. This provision did not impact the Company’s Consolidated Financial Statements as the Company presented employee taxes as a financing activity in its Consolidated Statements of Cash Flows.

The Company excluded the excess tax benefits from the assumed proceeds available to repurchase shares in the computation of diluted earnings per share for 2016, which did not materially increase the diluted weighted average common shares outstanding.

4. NEW ACCOUNTING STANDARDS NOT YET ADOPTED

In January 2017, the FASB issued ASU No. 2017-04, “Intangibles—Goodwill and Other (Topic 350), Simplifying the Test for Goodwill Impairment.” The guidance removes Step 2 of the goodwill impairment test and eliminates the need to determine the fair value of individual assets and liabilities to measure goodwill impairment. A goodwill impairment will now be the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. Entities will continue to have the option to perform a qualitative assessment to determine if a quantitative impairment test is necessary. The guidance is to be applied prospectively, and is effective for annual and interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Early adoption is permitted for any impairment tests performed on testing dates after January 1, 2017. The Company intends to adopt the guidance on the effective date and does not believe adoption will have a material impact on its financial condition or results of operations.

In August 2016, the FASB issued ASU No. 2016-15, “Statement of Cash flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments.” The guidance is intended to reduce diversity in practice across all industries in how certain transactions are classified in the statement of cash flows. The guidance is effective for financial statements issued for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted. The guidance requires application using a retrospective translation method. The Company intends to adopt the guidance on the effective date and does not believe adoption will have a material impact on its consolidated financial statements.

In February 2016, the FASB issued ASU No. 2016-02, “Leases (Topic 842).” The standard requires lessees to recognize leases on the balance sheet as a right-of-use asset and a lease liability, other than leases that meet the definition of a short-term lease. The liability will be equal to the present value of the lease payments. The asset will be based on the liability, subject to adjustment. For income statement purposes, the leases will continue to be classified as either operating or finance. Operating leases will result in straight-line expense (similar to current operating leases) and finance leases will result in a front-loaded expense pattern (similar to current capital leases). The standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Early adoption is permitted. The standard must be adopted using the modified retrospective transition method and provides for the option to elect a package of practical expedients upon adoption. The Company intends to adopt the standard in the first quarter of fiscal 2019, and is currently assessing the impact of adoption of the standard on its consolidated financial statements and related note disclosures. The Company has not made any decision on the option to elect adoption of the practical expedients.

In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers,” and issued subsequent amendments to the initial guidance in August 2015 within ASU No. 2015-14, in March 2016 within ASU No. 2016-08, in April 2016 within ASU No. 2016-10, in May 2016 within ASU No. 2016-12, and in December 2016 within ASU No. 2016-20 (collectively, the new standard). The new standard provides a single, comprehensive model for revenue arising from contracts with customers and supersedes most current revenue recognition guidance. The new standard requires an entity to

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recognize revenue at an amount that reflects the consideration to which the entity expects to be entitled in exchange for transferring goods or services to a customer. The Company intends to adopt the new standard in the first quarter of fiscal 2018. Currently, the Company intends to use the retrospective application to each reporting period presented, with the option to elect certain practical expedients as defined in the new standard. The Company does not believe adoption of the new standard will have a material impact on its Consolidated Statements of Comprehensive Income, but expects expanded financial statement footnote disclosure. The Company is continuing to evaluate the impacts of the pending adoption. As such, the Company’s preliminary assessments are subject to change.

5. INVENTORIES

Inventories, at LIFO (last-in, first-out) value, consist of the following (in thousands):

	March 31, 2017			December 31, 2016
Finished goods	$	31,652		$	29,686
Raw materials		19,828			20,231
Total FIFO (first-in, first-out) inventories		51,480			49,917
Reserve to adjust inventories to LIFO value		(21,371	)		(21,371	)
Total LIFO inventories	$	30,109		$	28,546

The Company utilizes the LIFO method of accounting for inventory, which generally provides for the matching of current costs with current revenues. However, under the LIFO method, reductions in annual inventory balances cause a portion of the Company’s cost of sales to be based on historical costs rather than current year costs (LIFO liquidation). Reductions in interim inventory balances expected to be replenished by year-end do not result in a LIFO liquidation. Accordingly, interim LIFO calculations are based, in part, on management’s estimates of expected year-end inventory levels and costs which may differ from actual results. Since inventory levels and costs are subject to factors beyond management’s control, interim results are subject to the final year-end LIFO inventory valuation. There were no LIFO inventory liquidations or related impact on cost of sales in the three months ended March 31, 2017 or 2016.

6. PREPAID EXPENSES AND OTHER ASSETS

Prepaid expenses and other assets consist of the following (in thousands):

	March 31, 2017		December 31, 2016
Prepaid expenses	$	3,904	$	6,209
Income tax receivable		—		4,024
Other		167		167
Total prepaid expenses and other assets	$	4,071	$	10,400

7. ACCRUED EXPENSES AND OTHER LIABILITIES

Accrued expenses and other liabilities consist of the following (in thousands):

	March 31, 2017		December 31, 2016
Sales and marketing	$	13,408	$	16,707
Compensation and benefits		3,662		13,298
Income taxes		9,167		—
Manufacturing costs		1,734		1,799
Rent obligations		668		632
Other		2,469		2,257
Total accrued expenses and other liabilities	$	31,108	$	34,693

8. DEBT

The Company’s outstanding debt consists of a revolving credit facility.

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Revolving Credit Facility

Through January 11, 2016, the Company’s Second Amended and Restated Credit Agreement provided the Company with one or more revolving loans in a collective maximum principal amount of $150 million from January 1 through June 30 of each year, and a maximum principal amount of $100 million from July 1 through December 31 of each year.

On January 12, 2016, the Company entered into a Third Amended and Restated Credit Agreement, as amended, with Bank of America, N.A. as Lender, Administrative Agent, Swing Line Lender and Letter of Credit Issuer, and certain other lenders including Citibank, N.A., Capital One, N.A., and SunTrust. The Third Amended Credit Agreement, as amended, provides the Company with one or more revolving loans in a collective maximum principal amount of $250 million from January 1 through June 30 of each year, and a maximum principal amount of $200 million from July 1 through December 31 of each year throughout the term, which ends January 12, 2021.

The Company had $77 million in outstanding borrowings under its revolving credit facility and remaining available borrowing capacity of $173 million at March 31, 2017.

Compliance with Debt Covenants and Restrictions

The Company’s ability to make scheduled principal and interest payments, borrow and repay amounts under any outstanding revolving credit facility and continue to comply with any loan covenants depends primarily on the Company’s ability to generate sufficient cash flow from operations.

As of March 31, 2017, the Company was in compliance with all of the covenants contained in its debt agreements. Failure to comply with the loan covenants might cause lenders to accelerate the repayment obligations under the credit facility, which may be declared payable immediately based on a default.

9. FINANCIAL INSTRUMENTS

The Company considers the recorded value of its financial assets and liabilities, consisting primarily of cash and cash equivalents, accounts receivable, accounts payable, accrued expenses and other current liabilities to approximate the fair value of the respective assets and liabilities at March 31, 2017 and December 31, 2016.

10. STOCKHOLDERS’ EQUITY

Earnings Per Share

The following table sets forth the computation of basic and diluted earnings per share (in thousands, except share and per share data):

	Three Months Ended March 31,
	2017		2016
Numerator:
Net income available to common shareholders	$	27,949	$	23,706
Denominator:
Basic weighted average shares outstanding		29,363,210		29,697,722
Effect of dilutive securities:
Stock appreciation rights and options		100,585		148,047
Restricted stock		97,611		64,523
Diluted weighted average shares outstanding		29,561,406		29,910,292
Basic earnings per share	$	0.95	$	0.80
Diluted earnings per share	$	0.95	$	0.79

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Diluted earnings per share is computed using the weighted average number of shares determined for the basic earnings per share computation plus the dilutive effect of common stock equivalents using the treasury stock method. The computation of diluted earnings per share excludes the following potentially dilutive securities because the effect would be anti-dilutive:

	Three Months Ended March 31,
	2017		2016
Stock appreciation rights		8,170		18,523

Stock Repurchase Programs

On October 22, 2015, the Board of Directors adopted a stock repurchase program of up to 3,150,000 shares of the Company’s outstanding common stock (October 2015 Stock Repurchase Program). This authorization terminated on December 31, 2016. The Company had repurchased 1,578,952 shares for $53.3 million under the October 2015 Stock Repurchase Program.

On February 16, 2017, the Board of Directors authorized a common stock repurchase program of up to 2,960,000 shares of the Company’s outstanding common stock (February 2017 Stock Repurchase Program). As of the date of this report, the Company has made no repurchases under the February 2017 Stock Repurchase Program.

11. STOCK-BASED COMPENSATION

The Company has one stock-based compensation plan, the 2014 Stock Incentive Plan (Plan), approved by the Company’s stockholders in April 2014. The Plan amended and restated in its entirety the Trex Company, Inc. 2005 Stock Incentive Plan. The Plan is administered by the Compensation Committee of the Company’s Board of Directors. Stock-based compensation is granted to officers, directors and certain key employees in accordance with the provisions of the Plan. The Plan provides for grants of stock options, restricted stock, restricted stock units, stock appreciation rights (SARs), and unrestricted stock. As of March 31, 2017, the total aggregate number of shares of the Company’s common stock that may be issued under the Plan is 6,420,000.

In 2014, the Company began granting performance-based restricted stock in addition to the time-based restricted stock it previously granted. The performance-based restricted shares have a three-year vesting period, vesting one-third each year based on target earnings before interest, taxes, depreciation and amortization for 1 year, cumulative 2 years and cumulative 3 years, respectively. The number of shares that vest, with respect to each vesting, will be between 0% and 200% of the target number of shares.

In 2015, the Company began issuing restricted stock units in lieu of restricted stock. Accordingly, time-based restricted stock units replaced time-based restricted stock and performance-based restricted stock units replaced performance-based restricted stock. The vesting terms of the restricted stock units are identical to the vesting provisions of the restricted stock.

The fair value of each SAR is estimated on the date of grant using a Black-Scholes option-pricing formula. There were no SARs issued during the three months ended March 31, 2016. For SARs issued in the three months ended March 31, 2017 the data and assumptions shown in the following table were used:

	Three Months Ended March 31, 2017
Weighted-average fair value of grants	$	27.81
Dividend yield		0	%
Average risk-free interest rate		2.0	%
Expected term (years)		5
Expected volatility		42	%

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The following table summarizes the Company’s stock-based compensation grants for the three months ended March 31, 2017:

	Stock Awards Granted		Weighted-Average Grant Price Per Share
Time-based restricted stock units		19,391	$	70.07
Performance-based restricted stock units (a)		40,216	$	56.19
Stock appreciation rights		16,340	$	70.09

(a) Includes 22,895 of target performance-based restricted stock unit awards granted during the three months ended March 31, 2017, and adjustments of 1,071, 5,396, and 10,854 grants due to the actual performance level achieved for restricted stock and restricted stock units awarded in 2014, 2015, and 2016, respectively.

The Company recognizes stock-based compensation expense ratably over the period from the grant date to the earlier of: (1) the vesting date of the award, or (2) the date the grantee is eligible to retire without forfeiting the award. For performance-based restricted stock and performance-based restricted stock units, expense is recognized ratably over the performance and vesting period of each tranche based on management’s judgment of the ultimate award that is likely to be paid out based on the achievement of the predetermined performance measures. The following table summarizes the Company’s stock-based compensation expense (in thousands):

	Three Months Ended March 31,
	2017		2016
Stock appreciation rights	$	167	$	109
Time-based restricted stock and units		737		616
Performance-based restricted stock and units		1,039		511
Employee stock purchase plan		22		40
Total stock-based compensation	$	1,965	$	1,276

Total unrecognized compensation cost related to unvested awards as of March 31, 2017 was $5.1 million. The cost of these unvested awards is being recognized over the requisite vesting period of each award.

12. INCOME TAXES

The Company’s effective tax rate for the three months ended March 31, 2017 and 2016 was 33.0% and 35.0%, respectively, which resulted in expense of $13.7 million and $12.7 million, respectively. The difference of 2.0% in the effective tax rate was primarily due to higher excess tax benefits recognized in income tax expense during the three months ended March 31, 2017 compared to the same period in 2016. In fiscal year 2016, the Company adopted FASB ASU No. 2016-09, “Compensation – Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting.” The new standard requires excess tax benefits on share-based awards be recognized in the tax provision instead of in equity.

During the three months ended March 31, 2017 and March 31, 2016, the Company realized $1.0 million and $0.4 million, respectively, of excess tax benefits from stock-based awards and recorded a corresponding benefit to income tax expense.

The Company analyzes its deferred tax assets each reporting period, considering all available positive and negative evidence in determining the expected realization of those deferred tax assets. As of March 31, 2017, the Company maintains a valuation allowance of $4.1 million against deferred tax assets primarily related to state tax credits it estimates will expire before they are realized.

The Company operates in multiple tax jurisdictions and, in the normal course of business, its tax returns are subject to examination by various taxing authorities. Such examinations may result in future assessments by these taxing authorities, and the Company accrues a liability when it believes that it is more likely than not that benefits of tax positions will not be realized. The Company believes that adequate provisions have been made for all tax returns subject to examination. As of March 31, 2017, Federal tax years 2013 through 2016 remain subject to examination. Sales made to foreign distributors are not taxable in any foreign jurisdictions as the Company does not have a taxable presence in any foreign jurisdiction.

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13. SEASONALITY

The Company’s operating results have historically varied from quarter to quarter. Seasonal, erratic or prolonged adverse weather conditions in certain geographic regions during the first and fourth quarters reduce the level of home improvement and construction activity and can shift demand for Trex products to a later period. As part of its normal business practice and consistent with industry practice, the Company has historically offered incentive programs to its distributors and dealers to build inventory levels before the start of the prime deck-building season in order to ensure adequate availability of the Company’s product to meet anticipated seasonal consumer demand. The seasonal effects experienced during the first and fourth quarters are often offset by the positive effect of the incentive programs.

14. COMMITMENTS AND CONTINGENCIES

Contract Termination Costs

The Company leases 55,047 square feet of office and storage space that it does not occupy, but has sublet all of the office space for the remainder of the term of its lease obligation, which ends June 30, 2019. The Company estimates that the future sublease receipts will be less than the remaining minimum lease payment obligations under its lease and has recorded a liability for the present value of the expected shortfall.

As of March 31, 2017, minimum payments remaining under the Company’s lease relating to its reconsidered corporate relocation over the years ending December 31, 2017, 2018, and 2019 are $1.4 million, $2.0 million and $1.1 million, respectively. Net minimum receipts remaining under the Company’s existing subleases over the years ending December 31, 2017, 2018 and 2019 are $1.0 million, $1.3 million and $0.7 million, respectively.

The following table provides information about the Company’s liability related to the lease (in thousands):

	2017			2016
Beginning balance, January 1	$	1,475		$	2,106
Net rental payments		(156	)		(248	)
Accretion of discount		28			40
Ending balance, March 31	$	1,347		$	1,898

Product Warranty

The Company warrants that its products will be free from material defects in workmanship and materials. This warranty generally extends for a period of 25 years for residential use and 10 years for commercial use, excluding TrexTrim™ and Trex Reveal^® Railing, which have a warranty period of 25 years for both residential and commercial use. The Company further warrants that Trex Transcend^®, Trex Enhance^®, Trex Select^® and Universal Fascia products will not fade in color more than a certain amount and will be resistant to permanent staining from food substances or mold, provided the stain is cleaned within seven days of appearance. This warranty extends for a period of 25 years for residential use and 10 years for commercial use. If there is a breach of such warranties, the Company has an obligation either to replace the defective product or refund the purchase price.

The Company continues to receive and settle claims for products manufactured at its Nevada facility prior to 2007 that exhibit surface flaking and maintains a warranty reserve to provide for the settlement of these claims. Estimating the warranty reserve for surface flaking claims requires management to estimate (1) the number of claims to be settled with payment and (2) the average cost to settle each claim.

To estimate the number of claims to be settled with payment, the Company utilizes actuarial techniques to quantify both the expected number of claims to be received and the percentage of those claims that will ultimately require payment (collectively, elements). Estimates for these elements are quantified using a range of assumptions derived from claim count history and the identification of factors influencing the claim counts. The number of claims received has declined each year since peaking in 2009, although the rate of decline has decelerated in recent years. Additionally, events, such as the 2009 settlement of a class action lawsuit covering the surface defect and communications by the Company in 2013 informing homeowners of potential hazards associated with products exhibiting surface flaking that are not timely replaced, have obscured observable trends in historical claims activity. The cost per claim varies due to a number of factors, including the size of affected decks, the availability and type of replacement material used, the cost of production of replacement material and the method of claim settlement.

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The Company monitors surface flaking claims activity each quarter for indications that its estimates require revision. Typically, a majority of surface flaking claims received in a year are received during the summer outdoor season, which spans the second and third quarters. It has been the Company’s practice to utilize the actuarial techniques discussed above during the third quarter, after a significant portion of all claims has been received for the fiscal year and variances to annual claims expectations are more meaningful. The number of claims received in the three months ended March 31, 2017 was lower than claims received in the three months ended March 31, 2016, continuing the historical year-over-year decline in incoming claims, but slightly higher than the Company’s expectations. The average settlement cost per claim experienced in the three months ended March 31, 2017 was higher than the average settlement cost per claim experienced during the three months ended March 31, 2016 and higher than the Company’s expectations for 2017. Continued settlement of claims at this elevated cost may require additional increases in the Company’s surface flaking reserve. However, the Company believes its reserve at March 31, 2017 is sufficient to cover future surface flaking obligations.

The Company’s analysis is based on currently known facts and a number of assumptions, as discussed above, and current expectations. Projecting future events such as the number of claims to be received, the number of claims that will require payment and the average cost of claims could cause the actual warranty liabilities to be higher or lower than those projected, which could materially affect the Company’s financial condition, results of operations or cash flows. The Company estimates that the annual number of claims received will continue to decline over time and that the average cost per claim will increase slightly, primarily due to inflation. If the level of claims received or average cost per claim differs materially from expectations, it could result in additional increases or decreases to the warranty reserve and a decrease or increase in earnings and cash flows in future periods. The Company estimates that a 10% change in the expected number of remaining claims to be settled with payment or the expected cost to settle claims may result in approximately a $3.3 million change in the surface flaking warranty reserve.

The following is a reconciliation of the Company’s warranty reserve that represents amounts accrued for surface flaking claims (in thousands):

	2017			2016
Beginning balance, January 1	$	33,847		$	29,673
Changes in estimates related to pre-existing warranties		—			—
Settlements made during the period		(1,114	)		(1,074	)
Ending balance, March 31	$	32,733		$	28,599

The remainder of the Company’s warranty reserve represents amounts accrued for non-surface flaking claims.

Legal Matters

The Company has lawsuits, as well as other claims, pending against it which are ordinary routine litigation and claims incidental to the business. Management has evaluated the merits of these lawsuits and claims, and believes that their ultimate resolution will not have a material effect on the Company’s consolidated financial condition, results of operations, liquidity or competitive position.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

The following management discussion should be read in conjunction with the Trex Company, Inc. (Company, we or our) Annual Report on Form 10-K for the year ended December 31, 2016 filed with the U.S. Securities and Exchange Commission (SEC) and the condensed consolidated financial statements and notes thereto included in Part I, Item 1. “Financial Statements” of this quarterly report.

NOTE ON FORWARD-LOOKING STATEMENTS

This management’s discussion and analysis contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. All statements regarding our expected financial position and operating results, our business strategy, our financing plans, forecasted demographic and economic trends relating to our industry and similar matters are forward-looking statements. These statements can sometimes be identified by our use of forward-looking words such as “may,” “will,” “anticipate,” “estimate,” “expect,” “intend” or similar expressions. We cannot promise you that our expectations in such forward-looking statements will turn out to be correct. Our actual results could be materially different from our expectations because of various factors, including the factors discussed under “Item 1A. Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2016 filed with the SEC. These statements are also subject to risks and uncertainties that could cause the Company’s actual operating results to differ materially. Such risks and uncertainties include, but are not limited to: the extent of market acceptance of the Company’s current and newly developed products; the costs associated with the development and launch of new products and the market acceptance of such new products; the sensitivity of the Company’s business to general economic conditions; the impact of seasonal and weather-related demand fluctuations on inventory levels in the distribution channel and sales of the Company’s products; the availability and cost of third-party transportation services for the Company’s products; the Company’s ability to obtain raw materials at acceptable prices; the Company’s ability to maintain product quality and product performance at an acceptable cost; the level of expenses associated with product replacement and consumer relations expenses related to product quality; and the highly competitive markets in which the Company operates.

OVERVIEW

General. Trex Company, Inc. is the world’s largest manufacturer of high-performance composite decking and railing products, which are marketed under the brand name Trex^® and manufactured in the United States. We offer a comprehensive set of aesthetically durable, low-maintenance product offerings in the decking, railing, porch, fencing, trim, steel deck framing, and outdoor lighting categories. We believe that the range and variety of our product offerings allow consumers to design much of their outdoor living space using Trex brand products. A majority of our products are made in a proprietary process that combines reclaimed wood fibers and scrap polyethylene. Our products are provided in a wide selection of sizes and lengths and are available with several finishes and numerous colors. Trex products offer a number of significant aesthetic advantages over wood while providing a better alternative for many of wood’s major functional disadvantages, which include warping, splitting and other damage from moisture. Our products require no staining, are resistant to moisture damage, provide a splinter-free surface and do not require chemical treatment against rot or insect infestation. These qualities result in low-maintenance products when compared to the on-going maintenance requirements for a wood deck and make Trex products less costly than wood over the life of the deck. Trex products are stain resistant and color fast. Special characteristics (including resistance to splitting, the ability to bend, and ease and consistency of machining and finishing) facilitate deck, railing, porch, fencing and trim installation, reduce contractor call-backs and afford consumers a wide range of design options.

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We offer the following products:

Decking	Our principal decking products are Trex Transcend®, Trex Enhance® and Trex Select®. Our decking products are comprised of a blend of 95 percent recycled wood and recycled plastic film and feature a protective polymer shell for enhanced protection against fading, staining, mold and scratching. We also offer Trex Hideaway®, a hidden fastening system for grooved boards. We have a product in development, which is a high performance decking product that will be focused on the top end of the market with outstanding aesthetics and performance capabilities.
Railing	Our railing products are Trex Transcend Railing, Trex Select Railing, and Trex Signature® aluminum railing. Trex Transcend Railing is available in the colors of Trex Transcend decking and finishes that make it appropriate for use with Trex decking products as well as other decking materials, which we believe enhances the sales prospects of our railing products. Trex Select Railing is offered in a white finish and is ideal for consumers who desire a simple clean finished look for their deck. Trex Signature® aluminum railing is available in three colors and designed for consumers who want a sleek, contemporary look.
Porch	Our Trex Transcend Porch Flooring and Railing System is an integrated system of porch components and accessories.
Fencing	Our Trex Seclusions® fencing product is offered through two specialty distributors. This product consists of structural posts, bottom rail, pickets, top rail and decorative post caps.
Steel Deck  Framing	Our triple-coated steel deck framing system called Trex Elevations® leverages the strength and dimensional stability of steel to create a flat surface for our decking. Trex Elevations provides consistency and reliability that wood does not and is fire resistant.
Outdoor Lighting	Our outdoor lighting systems are Trex DeckLighting™ and Trex LandscapeLighting™. Trex DeckLighting is a line of energy-efficient LED dimmable deck lighting, which is designed for use on posts, floors and steps. The line includes a post cap light, deck rail light, riser light and a recessed deck light. The Trex LandscapeLighting line includes an energy-efficient well light, path light, multifunction light and spotlight.

Highlights for the three months ended March 31, 2017:

• Net sales of $144.8 million for the three months ended March 31, 2017, an increase of 10.0% over net sales of $131.7 million for the three months ended March 31, 2016.

• Gross profit as a percentage of net sales, gross margin, of 45.0% for the three months ended March 31, 2017, an increase of 120 basis points over the gross margin of 43.8% for the three months ended March 31, 2016.

• Net income of $27.9 million for the three months ended March 31, 2017, or $0.95 per diluted share, compared to $23.7 million, or $0.79 per diluted share, for the same period in 2016.

Net Sales. Net sales consist of sales and freight, net of returns and discounts. The level of net sales is principally affected by sales volume and the prices paid for Trex products. Our branding and product differentiation strategy enables us to command premium prices over wood products. Our operating results have historically varied from quarter to quarter, often due to seasonal trends in the demand for outdoor living products. We have historically experienced lower net sales during the fourth quarter due to the holiday season. Also, seasonal, erratic or prolonged adverse weather conditions in certain geographic regions reduce the level of home improvement and construction activity and can shift net sales to a later period.

As part of our normal business practice and consistent with industry practices, we have historically provided our distributors and dealers incentives to build inventory levels before the start of the prime deck-building season to ensure adequate availability of our product to meet anticipated seasonal consumer demand and to enable production planning. These incentives include payment discounts and favorable payment terms. In addition, we offer price discounts or volume rebates on specified products and other incentives based on increases in purchases as part of specific promotional programs. The timing of sales incentive programs can significantly impact sales, receivables and inventory levels during the offering period. However, the timing and terms of the majority of our programs are generally consistent from year to year.

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Gross Profit. Gross profit represents the difference between net sales and cost of sales. Cost of sales consists of raw materials costs, direct labor costs, manufacturing costs and freight. Raw materials costs generally include the costs to purchase and transport reclaimed wood fiber, reclaimed polyethylene and pigmentation for coloring our products. Direct labor costs include wages and benefits of personnel engaged in the manufacturing process. Manufacturing costs consist of costs of depreciation, utilities, maintenance supplies and repairs, indirect labor, including wages and benefits, and warehouse and equipment rental activities.

Product Warranty. We warrant that our products will be free from material defects in workmanship and materials for warranty periods ranging from 10 years to 25 years, depending on the product and its use. If there is a breach of such warranties, we have an obligation either to replace the defective product or refund the purchase price. We continue to receive and settle claims for products manufactured at our Nevada facility prior to 2007 that exhibit surface flaking and maintain a warranty reserve to provide for the settlement of these claims. The number of claims received has declined each year since peaking in 2009, although the rate of decline has decelerated in recent years. Additionally, events, such as the 2009 settlement of a class action lawsuit covering the surface defect and 2013 communications made by the Company informing homeowners of potential hazards associated with products exhibiting surface flaking that are not timely replaced, have obscured any observable trends in historical claims activity.

We monitor surface flaking claims activity each quarter for indications that our estimates require revision. Typically, a majority of surface flaking claims received in a fiscal year are received during the summer outdoor season, which spans the second and third fiscal quarters. It has been our practice to utilize actuarial techniques during the third quarter, after a significant portion of all claims has been received for the fiscal year and variances to annual claims expectations are more meaningful. Our actuarial analysis is based on currently known facts and a number of assumptions. Projecting future events such as the number of claims to be received, the number of claims that will require payment and the average cost of claims could cause the actual warranty liabilities to be higher or lower than those projected, which could materially affect our financial condition, results of operations or cash flows. The number of claims received in the three months ended March 31, 2017 was lower than the claims received in the three months ended March 31, 2016, continuing the historical year-over-year decline in incoming claims, but slightly higher than our expectations. The average settlement cost per claim experienced in the three months ended March 21, 2017 was higher than the average settlement cost per claim experienced during the three months ended March 31, 2016, and higher than expectations for 2017. However, we believe that our reserve at March 31, 2017 is sufficient to cover future surface flaking obligations.

The following table details surface flaking claims activity related to our warranty:

	Three Months Ended March 31,
	2017			2016
Claims open, beginning of period		2,755			2,500
Claims received (1)		414			485
Claims resolved (2)		(502	)		(595	)
Claims open, end of period		2,667			2,390
Average cost per claim (3)	$	2,848		$	2,803

(1) Claims received include new claims received or identified during the period.

(2) Claims resolved include all claims settled with or without payment and closed during the period.

(3) Average cost per claim represents the average settlement cost of claims closed with payment during the period.

Selling, General and Administrative Expenses. The largest component of selling, general and administrative expenses is personnel related costs, which include salaries, commissions, incentive compensation, and benefits of personnel engaged in sales and marketing, accounting, information technology, corporate operations, research and development, and other business functions. Another component of selling, general and administrative expenses is branding and other sales and marketing costs, which are used to build brand awareness. These costs consist primarily of advertising, merchandising, and other promotional costs. Other general and administrative expenses include professional fees, office occupancy costs attributable to the business functions previously referenced, and consumer relations expenses. As a percentage of net sales, selling, general and administrative expenses may vary from quarter to quarter due, in part, to the seasonality of our business.

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RESULTS OF OPERATIONS

Below is our discussion and analysis of our operating results and material changes in our operating results for the three months ended March 31, 2017 (2017 quarter) compared to the three months ended March 31, 2016 (2016 quarter).

Three Months Ended March 31, 2017 Compared To The Three Months Ended March 31, 2016

Net Sales

	Three Months Ended March 31,				$ Change		% Change
	2017		2016
	(dollars in thousands)
Net sales	$	144,806	$	131,676	$	13,130		10.0	%

The 10.0% increase in net sales in the 2017 quarter compared to the 2016 quarter was due to volume growth of our core Trex branded decking and railing products, which was positively impacted by continued strength in the remodeling sector and execution of our market growth strategies. Sales volume was also positively impacted by customers taking advantage of the 2017 sales programs that provide incentives for our distributors and dealers to build inventory levels before the start of the prime deck-building season, and from favorable weather and economic conditions.

Gross Profit

	Three Months Ended March 31,						$ Change		% Change
	2017			2016
	(dollars in thousands)
Cost of sales	$	79,637		$	74,049		$	5,588		7.5	%
% of net sales		55.0	%		56.2	%
Gross profit	$	65,169		$	57,627		$	7,542		13.1	%
Gross margin		45.0	%		43.8	%

Gross profit as a percentage of net sales, gross margin, increased to 45.0% in the 2017 quarter from 43.8% in the 2016 quarter, an improvement of 120 basis points, and was achieved primarily through improved capacity utilization, cost improvement initiatives, and lower cost raw materials.

Selling, General and Administrative Expenses

	Three Months Ended March 31,						$ Change		% Change
	2017			2016
	(dollars in thousands)
Selling, general and administrative expenses	$	23,269		$	20,612		$	2,657		12.9	%
% of net sales		16.1	%		15.7	%

The $2.7 million increase in selling, general and administrative expenses in the 2017 quarter compared to the 2016 quarter resulted primarily from an increase of $1.2 million related to branding and advertising spend in support of our market growth strategies and $0.8 million related to research and development. As a percentage of net sales, total selling, general and administrative expenses increased by 40 basis points in the 2017 quarter compared to the 2016 quarter.

Interest Expense

	Three Months Ended March 31,						$ Change			% Change
	2017			2016
	(dollars in thousands)
Interest expense	$	204		$	572		$	(368	)		(64.3	)%
% of net sales		0.1	%		0.4	%

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The decrease in interest expense was due to a $50.5 million decrease in the average outstanding borrowings during the 2017 quarter compared to the 2016 quarter, partially offset by a slight increase in the effective interest rate. The decrease in borrowings was due to a higher year-end cash balance at December 31, 2016 compared to December 31, 2015, which resulted in lower outstanding borrowings during the 2017 quarter.

Provision for Income Taxes

	Three Months Ended March 31,
	2017			2016 (Adjusted)			$ Change		% Change
	(dollars in thousands)
Provision for income taxes	$	13,747		$	12,737		$	1,010		7.9	%
Effective tax rate		33.0	%		35.0	%

The effective tax rate for the 2017 quarter decreased by 200 basis points compared to the effective tax rate for the 2016 quarter primarily due to higher excess tax benefits related to the settlement or vesting of restricted stock or restricted stock units recognized in income tax expense during the 2017 quarter compared to the 2016 quarter. In 2016, we adopted Financial Accounting Standards Board Accounting Standards Update No. 2016-09, “Compensation – Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting.” The standard requires that excess tax benefits of the settlement or vesting of time-based restricted stock or time-based restricted stock units and performance-based restricted stock or performance-based restricted stock units be recorded within income tax expense. Prior to adoption this amount would have been recorded as an increase in additional paid-in capital. As a result of adoption of the standard, the provision for income taxes for the 2016 quarter was adjusted to $12,737 from the $13,041 previously reported.

LIQUIDITY AND CAPITAL RESOURCES

We finance operations and growth primarily with cash flows from operations, borrowings under our revolving credit facility, operating leases and normal trade credit terms from operating activities.

At March 31, 2017, we had $1.8 million of cash and cash equivalents.

Sources and Uses of Cash. The following table summarizes our cash flows from operating, investing and financing activities (in thousands):

	Three Months Ended March 31,
	2017			2016
Net cash used in operating activities	$	(86,444	)	$	(84,120	)
Net cash (used in) provided by investing activities	$	(4,312	)	$	1,810
Net cash provided by financing activities	$	73,859		$	80,119
Net decrease in cash and cash equivalents	$	(16,897	)	$	(2,191	)

Operating Activities

Net cash used in operating activities was $86.4 million in the 2017 quarter compared to net cash used in operating activities of $84.1 million in the 2016 quarter. The net increase in cash used in operating activities in the 2017 quarter compared to the 2016 quarter was primarily due to the effects of a 10.0% increase in net sales during the 2017 quarter driving an increase in accounts receivable balances. This increase was offset by favorable net income and a reduction in working capital, excluding accounts receivable.

Investing Activities

Capital expenditures in the 2017 quarter were $4.3 million, consisting primarily of $2.6 million for general plant cost reduction initiatives, and expenditures related to equipment and new product development. In January 2016, the Company sold a portion of the Olive Branch facility that contained the buildings for $4.2 million and, as of March 31, 2017, the Company continues to own approximately 62 acres of undeveloped land adjacent to the sold properties. Capital expenditures in the 2016 quarter were $2.4 million primarily consisting of $0.6 million for general cost reduction initiatives, $0.5 million related to our state-of-the-art training facility, Trex University, located near our Winchester, Virginia headquarters, and $1.3 million for all other spending.

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Financing Activities

Net cash provided by financing activities was $73.8 million in the 2017 quarter compared to $80.1 million in the 2016 quarter. The decrease was primarily due to a decrease in net outstanding borrowings under our line of credit, offset by $53.3 million in stock repurchase activity in the 2016 quarter.

Stock Repurchase Programs.

On October 22, 2015, the Board of Directors adopted a new stock repurchase program of up to 3.15 million shares of the Company’s outstanding common stock (October 2015 Stock Repurchase Program). This authorization terminated on December 31, 2016. The Company repurchased 1,578,952 shares for $53.3 million under the October 2015 Stock Repurchase Program.

On February 16, 2017, the Board of Directors authorized a common stock repurchase program of up to 2.96 million shares of the Company’s outstanding common stock (February 2017 Stock Repurchase Program). As of the date of this report, the Company has made no repurchases under the February 2017 Stock Repurchase Program.

Indebtedness. Our Third Amended and Restated Credit Agreement, as amended, provides us with revolving loan capacity in a collective maximum principal amount of $250 million from January 1 through June 30 of each year, and a maximum principal amount of $200 million from July 1 through December 31 of each year throughout the term, which ends January 12, 2021. At March 31, 2017, we had $77 million of outstanding indebtedness under the revolving credit facility and borrowing capacity under the facility of $173 million.

Debt Covenants. To remain in compliance with covenants contained within our debt agreements, we must maintain specified financial ratios based on levels of debt, fixed charges, and earnings (excluding extraordinary gains and extraordinary non-cash losses) before interest, taxes, depreciation and amortization. At March 31, 2017, we were in compliance with these covenants. Failure to comply with our loan covenants might cause our lenders to accelerate our repayment obligations under our credit facility, which may be declared payable immediately based on a default.

We believe that cash on hand, cash from operations and borrowings expected to be available under our revolving credit facility will provide sufficient funds to fund planned capital expenditures, make scheduled principal and interest payments, fund warranty payments, and meet other cash requirements. We currently expect to fund future capital expenditures from operations and financing activities. The actual amount and timing of future capital requirements may differ materially from our estimate depending on the demand for Trex products and new market developments and opportunities.

Capital Requirements. We currently estimate that our capital expenditures in 2017 will be in the $15 to $20 million range. Our capital allocation priorities include expenditures for internal growth opportunities, acquisitions which fit out long-term outdoor products growth strategy as we continue to evaluate opportunities that would be a good strategic fit for Trex, and return of capital to shareholders.

Inventory in Distribution Channels. We sell our products through a tiered distribution system. We have over 50 distributors worldwide and two national retail merchandisers to which we sell our products. The distributors in turn sell the products to dealers and retail locations who in turn sell the products to end users. While we do not typically receive any information regarding inventory in the distribution channel from any dealers, we occasionally receive limited information from some but not all of our distributors regarding their inventory. Because few distributors provide us with any information regarding their inventory, we cannot definitively determine the level of inventory in the distribution channels at any time. We are not aware of significant changes in the levels of inventory in the distribution channels at March 31, 2017 compared to inventory levels at March 31, 2016. Significant increases in inventory levels in the distribution channel without a corresponding change in end-use demand could have an adverse effect on future sales.

Product Warranty. We continue to receive and settle claims related to products manufactured at our Nevada facility prior to 2007 that exhibit surface flaking, which has had a material adverse effect on cash flow from operations, and regularly monitor the adequacy of the warranty reserve.

In the 2017 quarter and in the 2016 quarter we paid $1.1 million each quarter to settle surface flaking claims. We estimate that the number of claims received will continue to decline over time and that the average settlement cost per claim will increase slightly, primarily due to inflation. If the level of claims received or average settlement cost per claim differs materially from our expectations, it could result in additional increases or decreases to the warranty reserve and a decrease or increase in earnings and cash flow in future periods.

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Seasonality. Our operating results have historically varied from quarter to quarter. Seasonal, erratic or prolonged adverse weather conditions in certain geographic regions during the first and fourth quarters reduce the level of home improvement and construction activity and can shift demand for our products to a later period. As part of our normal business practice and consistent with industry practice, we have historically offered incentive programs to our distributors and dealers to build inventory levels before the start of the prime deck-building season in order to ensure adequate availability of our product to meet anticipated seasonal consumer demand. The seasonal effects experienced during the first and fourth quarters are often offset by the positive effect of the incentive programs.

Item 3. Quantitative and Qualitative Disclosures About Market Risk

For information regarding our exposure to certain market risks, see “Quantitative and Qualitative Disclosures about Market Risk,” in Part II, Item 7A of the Company’s Annual Report on Form 10-K for the year ended December 31, 2016. There were no material changes to the Company’s market risk exposure during the three months ended March 31, 2017.

Item 4. Controls and Procedures

The Company’s management, with the participation of its President and Chief Executive Officer, who is the Company’s principal executive officer, and its Vice President and Chief Financial Officer, who is the Company’s principal financial officer, has evaluated the effectiveness of the Company’s disclosure controls and procedures as of March 31, 2017. Based on this evaluation, the President and Chief Executive Officer and the Vice President and Chief Financial Officer have concluded that the Company’s disclosure controls and procedures are effective. In addition, there have been no changes in the Company’s internal control over financial reporting during the quarterly period ended March 31, 2017 that have materially affected, or are reasonably likely to materially affect, the Company’s internal control over financial reporting.

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PART II

OTHER INFORMATION

Item 1. Legal Proceedings

The Company has lawsuits, as well as other claims, pending against it which are ordinary routine litigation and claims incidental to the business. Management has evaluated the merits of these lawsuits and claims, and believes that their ultimate resolution will not have a material effect on the Company’s consolidated financial condition, results of operations, liquidity or competitive position.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

(c) The following table provides information relating to the purchases of our common stock during the quarter ended March 31, 2017 in accordance with Item 703 of Regulation S-K:

Period	(a) Total Number of Shares (or Units) Purchased (1)		(b) Average Price Paid per Share (or Unit) ($)		(c) Total Number of Shares (or Units) Purchased as Part of Publicly Announced Plans or Programs		(d) Maximum number of Shares (or Units) that May Yet Be Purchased Under the Plan or Program
January 1, 2017 – January 31, 2017		16,574	$	64.40		Not applicable		Not applicable
February 1, 2017 – February 29, 2017		31,041	$	69.97		Not applicable		Not applicable
March 1, 2017 – March 31, 2017		—		—		Not applicable		Not applicable
Quarter ended March 31, 2017		47,615				Not applicable

(1) Shares withheld by, or delivered to, the Company pursuant to provisions in agreements with recipients of restricted stock granted under the Company’s 2014 Stock Incentive Plan allowing the Company to withhold, or the recipient to deliver to the Company, the number of shares having the fair value equal to tax withholding due.

Item 5. Other Information

Submission of Matters to a Vote of Security Holders

The Company held its Annual Meeting of Stockholders on May 3, 2017. Only holders of the Company’s common stock at the close of business on March 6, 2017 (Record Date) were entitled to vote at the Annual Meeting. As of the Record Date, there were 29,404,718 shares of common stock entitled to vote. A total of 27,296,123 shares of common stock (92.83%), constituting a quorum, were represented in person or by valid proxies at the Annual Meeting.

The stockholders voted on three proposals at the Annual Meeting. The proposals are described in detail in the Company’s definitive proxy statement dated March 23, 2017 and amendment to the proxy statement filed on April 3, 2017. The final results for the votes regarding each proposal are set forth below.

Proposal 1: The Company’s stockholders elected three directors to the Board to serve for a three year term until the 2020 annual meeting of stockholders. The votes regarding this proposal were as follows:

	For		Withhold		Broker Non-Votes
Jay M. Gratz		22,830,102		1,454,399		3,011,622
Ronald W. Kaplan		22,959,535		1,324,966		3,011,622
Gerald Volas		22,948,609		1,335,892		3,011,622

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Proposal 2: The Company’s stockholders approved, on an advisory basis, the compensation of the Company’s executive officers named in the Company’s definitive proxy statement dated March 23, 2017. The votes regarding this proposal were as follows:

For	Against	Abstain	Broker Non-Votes
22,600,030	1,661,774	22,697	3,011,622

Proposal 3: The Company’s stockholders ratified the selection of Ernst & Young LLP as the Company’s independent registered public accounting firm for the fiscal year ending December 31, 2017. The votes regarding this proposal were as follows:

For	Against	Abstain	Broker Non-Votes
26,180,987	1,108,654	6,482	-0-

Proposal 4: The Company’s stockholders indicated their preference, on an advisory basis, that the advisory vote on executive compensation be held annually. The votes regarding this proposal were as follows:

1 Year	2 Years	3 Years	Abstain	Broker Non-Votes
19,887,180	26,062	4,161,455	31,956	3,187,974

As a result of the stockholders’ vote on this matter, the Board of Directors approved the frequency of shareholder voting on the compensation of its executive officers as once every year, until the Board of Directors approves otherwise.

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Item 6. Exhibits

The number and description of the following exhibits coincide with Item 601 of Regulation S-K:

3.1	Restated Certificate of Incorporation of Trex Company, Inc. (Company). Filed as Exhibit 3.1 to the Company’s Registration Statement on Form S-1 (No. 333-63287) and incorporated herein by reference.
3.2	Certificate of Amendment to the Restated Certificate of Incorporation of Trex Company, Inc. dated April 30, 2014. Filed as Exhibit 3.2 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2014 and incorporated herein by reference.
3.3	Amended and Restated By-Laws of the Company. Filed as Exhibit 3.2 to the Company’s Current Report on Form 8-K filed May 7, 2008 and incorporated herein by reference.
10.1	Form of Trex Company, Inc. 2014 Stock Incentive Plan Stock Appreciation Rights Agreement. Filed herewith.**
31.1	Certification of Chief Executive Officer of Trex Company, Inc. pursuant to Rule 13a-14(a) under the Securities Exchange Act of 1934. Filed herewith.
31.2	Certification of Chief Financial Officer of Trex Company, Inc. pursuant to Rule 13a-14(a) under the Securities Exchange Act of 1934. Filed herewith.
32	Certifications of Chief Executive Officer and Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (18 U.S.C. Section 1350). Furnished herewith.
101.INS	XBRL Instance Document. Filed.
101.SCH	XBRL Taxonomy Extension Schema Document. Filed.
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document. Filed.
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document. Filed.
101.LAB	XBRL Taxonomy Extension Label Linkbase Document. Filed.
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document. Filed.

** Management contract or compensatory plan or agreement.

22

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	TREX COMPANY, INC.
Date: May 5, 2017	By:	/s/ Bryan H. Fairbanks
		Bryan H. Fairbanks
		Vice President and Chief Financial Officer
		(Duly Authorized Officer and Principal Financial Officer)

EXHIBIT INDEX

Exhibit Number	Exhibit Description
3.1	Restated Certificate of Incorporation of Trex Company, Inc. (Company). Filed as Exhibit 3.1 to the Company’s Registration Statement on Form S-1 (No. 333-63287) and incorporated herein by reference.
3.2	Certificate of Amendment to the Restated Certificate of Incorporation of Trex Company, Inc. dated April 30, 2014. Filed as Exhibit 3.2 to the Company’s Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2014 and incorporated herein by reference.
3.3	Amended and Restated By-Laws of the Company. Filed as Exhibit 3.2 to the Company’s Current Report on Form 8-K filed May 7, 2008 and incorporated herein by reference.
10.1	Form of Trex Company, Inc. 2014 Stock Incentive Plan Stock Appreciation Rights Agreement. Filed herewith.**
31.1	Certification of Chief Executive Officer of Trex Company, Inc. pursuant to Rule 13a-14(a) under the Securities Exchange Act of 1934. Filed herewith.
31.2	Certification of Chief Financial Officer of Trex Company, Inc. pursuant to Rule 13a-14(a) under the Securities Exchange Act of 1934. Filed herewith.
32	Certifications of Chief Executive Officer and Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (18 U.S.C. Section 1350). Furnished herewith.
101.INS	XBRL Instance Document. Filed.
101.SCH	XBRL Taxonomy Extension Schema Document. Filed.
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document. Filed.
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document. Filed.
101.LAB	XBRL Taxonomy Extension Label Linkbase Document. Filed.
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document. Filed.

** Management contract or compensatory plan or agreement.

EX-10.1

Exhibit 10.1

TREX COMPANY, INC.

2014 STOCK INCENTIVE PLAN

STOCK APPRECIATION RIGHTS AGREEMENT

Trex Company, Inc., a Delaware corporation (the “Company”), hereby grants stock appreciation rights (“SARs”) relating to its common stock, $.01 par value, (the “Stock”) to the Grantee named below, subject to the vesting conditions set forth in the attachment. Additional terms and conditions of the grant are set forth in this cover sheet, in the attachment, and in the Company’s 2014 Stock Incentive Plan (the “Plan”).

Grant Date:                     

Name of Grantee:                                                                                       

Number of SARs:                     

SAR Grant Price per Share: $        

Vesting Schedule:	Vesting Date	Number of SARs
	Vest 1	#
	Vest 2	#
	Vest 3	#

Last Date to Exercise:                 ¹

By signing this cover sheet, you agree to all of the terms and conditions described in the attached Agreement and in the Plan. You acknowledge that you have carefully reviewed the Plan, and agree that unless otherwise specifically provided herein, the Plan will control in the event any provision of this Agreement should appear to be inconsistent.

Grantee:
	(Signature)
Company:
	William R. Gupp
	Senior Vice President, General Counsel and Secretary

This is not a stock certificate or a negotiable instrument.

¹  Certain events can cause an earlier termination of the SAR. See “Effects of Changes in Capitalization” in the Plan. This date shall be extended for one (1) year in the event your employment terminates due to your death during the tenth year of the term.

TREX COMPANY, INC.

2014 STOCK INCENTIVE PLAN

STOCK APPRECIATION RIGHTS AGREEMENT

SARs	The SARS are only exercisable before the Last Date to Exercise (noted on the cover sheet) and then only with respect to the vested portion of the SARs. Subject to the preceding sentence, you may exercise the SARs, in whole or in part, by following the procedures set forth in the Plan and below in this Agreement. For the purpose of this Agreement, “Service” means service as an employee of the Company or any Affiliate or service as Service Provider.
Vesting	Your right to exercise the SARs vests as to thirty three and one-third percent (331/3%) of the total number of SARs on each anniversary of the grant, as shown on the cover sheet, provided that you then continue in Service on each such vesting date. The resulting aggregate number of vested SARs will be rounded to the nearest whole number, and you may not vest in more than the number of SARs shown on the cover sheet. Except as otherwise provided herein, no SARs will vest after your Service has terminated for any reason.
Early Vesting	Upon the termination of your Services, other than by reason of your death, Disability, Retirement, or termination by the Company without “Cause” or at your election with “Good Reason,” any SARs that have not vested hereunder shall immediately be deemed forfeited and your vested SARs will expire at the close of business at Company headquarters on the 90th day after your termination date (or, if such 90th day is a Saturday, Sunday or holiday, at the close of business on the next preceding day that is not a Saturday, Sunday or holiday); but in any event no later than the Last Date to Exercise. In the event of the termination of your Services because of your death, Disability, or Retirement, any SARs that have not vested hereunder shall immediately become fully vested and will expire at the close of business at Company headquarters on the date five (5) years after your termination date (but not later than the Last Date to Exercise). During that five year period (but not later than the Last Date to Exercise), your or your estate or heirs may exercise your SARs. In the event of the termination of your Services by the Company without “Cause” or at your election with “Good Reason”, or in the event of a “Change in Control”, any SARs that have not vested hereunder shall immediately become fully vested and will expire at the close of business at Company headquarters on the 90th day after your termination date or Change in Control, whichever is applicable, (or, if such 90th day is a Saturday, Sunday or holiday, at the close of business on the next preceding day that is not a Saturday, Sunday or holiday); but in any event no later than the Last Date to Exercise. “Cause” means one of the following reasons for which your employment with the Company is terminated: (1) Your willful or grossly negligent misconduct that is materially injurious to the Company; (2) Your embezzlement or misappropriation of funds or property of the Company; (3) Your conviction of a felony or the entrance of a plea of guilty or nolo contendere to a felony; (4) Your conviction of any crime involving fraud, dishonesty, moral turpitude or breach of trust or the entrance of a plea of guilty or nolo contendere to such a crime; or (5) Your willful failure or refusal by you to devote your full business time (other than on account of disability or approved leave) and attention to the performance of your duties and responsibilities if such breach has not been cured within 15 days after written notice thereof is given to you by the Board of Directors. “Good Reason” shall exist upon: (1) a material and adverse change in your status or position(s) as an officer or management employee of the Company, including, without limitation, any adverse change in your status or position as an employee of the Company as

	a result of a material diminution in your duties or responsibilities (other than, if applicable, any such change directly attributable to the fact that the Company is no longer publicly owned) or the assignment to you of any duties or responsibilities which are materially inconsistent with such status or position(s) (other than any isolated and inadvertent failure by the Company that is cured promptly upon your giving notice), or any removal of you from or any failure to reappoint or reelect you to such position(s) (except in connection with your termination other than for Good Reason); (2) a 10% or greater reduction in your aggregate base salary and targeted bonus, other than any such reduction proportionately consistent with a general reduction of pay across the executive staff as a group, as an economic or strategic measure due to poor financial performance by the Company; (3) the failure by the Company to continue in effect any material employee benefit plan (excluding any equity compensation plan) in which you are participating (or plans providing you with similar benefits that are not materially reduced in the aggregate) other than as a result of the normal expiration of any such plan in accordance with its terms; or the taking of any action, or the failure to act, by the Company or any successor which would adversely affect your continued participation in any of such plans on at least as favorable a basis to you or which would materially reduce your benefits under any of such plans; (4) Company’s requiring you to be based at an office that is both more than 50 miles from where your office is located and further from your then current residence; or (5) a material breach by the Company of any agreement with you; provided, however, that if any of the conditions exists, you must provide written notice to the Company no more than ninety (90) calendar days following the initial existence of the condition and your intention to terminate your employment for Good Reason. Upon such notice, the Company shall have a period of thirty (30) calendar days during which it may remedy the condition and, if the Company fails to remedy such condition, you terminate your Services within ninety (90) calendar days following such failure. “Change in Control” shall have the meaning given to such term in the Change in Control Severance Agreement between you and the Company, provided that in all cases such Change in Control constitutes a “change in control event” within the meaning of Treasury Regulation Section 1.409A-3(i)(5)(i). Notwithstanding the foregoing or any other provision herein to the contrary, SARs shall also vest according to the terms and conditions, if so provided, in any separate agreement between you and the Company, including but not limited to any Employment Agreement, Severance Agreement or Change in Control Severance Agreement.
Notice of Exercise	When you wish to exercise this award of SARs, you must notify the Company by filing the proper “Notice of Exercise” form at the address given on the form. All exercises must take place before, and your SARs will expire on, the Last Date to Exercise (shown on the cover sheet), or such earlier date following your death, disability, retirement or other termination of your service as otherwise provided herein or a Change in Control. Your notice must specify how many SARs you wish to exercise. Your notice must also specify how the shares of Stock received on the exercise of your SARs should be registered (in your name only or in your and your spouse’s names as joint tenants with right of survivorship). The notice will be effective when it is received by the Company. If someone else wants to exercise the SARs after your death, that person must prove to the Company’s satisfaction that he or she is entitled to do so.
Payment for SARs	Upon your exercise of the SARs, the Company will pay you in shares of Stock an amount equal to the positive difference (if any) between the Fair Market Value of a share of Stock on the exercise date and the SAR Grant Price, multiplied by the number of SARs being exercised. Any fractional shares of Stock will be paid to you in cash.
Withholding Taxes	You agree, as a condition of this grant, that you will make acceptable arrangements to pay any withholding or other taxes that may be due as a result of the exercise of SARs. In the event that the Company determines that any federal, state, local or foreign tax or

	withholding payment is required relating to the exercise of SARs, the Company shall have the right to require such payments from you, withhold shares that would otherwise have been issued to you under this Agreement or withhold such amounts from other payments due to you from the Company or any Affiliate.
Retention Rights	This Agreement does not give you the right to be retained by the Company in any capacity. The Company reserves the right to terminate your Service at any time and for any reason.
Shareholder Rights	You, or your estate or heirs, have no rights as a shareholder of the Company until a certificate for shares of Stock received pursuant to the exercise of your SARS has been issued (or an appropriate book entry has been made). No adjustments are made for dividends or other rights if the applicable record date occurs before your stock certificate is issued (or an appropriate book entry has been made), except as described in the Plan.
Adjustments	In the event of a stock split, a stock dividend or a similar change in the Stock, the number of SARs and the SAR Grant Price per share shall be adjusted (and rounded down to the nearest whole number) if required pursuant to the Plan. Your SARs shall be subject to the terms of the agreement of merger, liquidation or reorganization in the event the Company is subject to such corporate activity.
Applicable Law	This Agreement will be interpreted and enforced under the laws of the State of Delaware, other than any conflicts or choice of law rule or principle that might otherwise refer construction or interpretation of this Agreement to the substantive law of another jurisdiction.
The Plan	The text of the Plan is incorporated in this Agreement by reference. Certain capitalized terms used in this Agreement are defined in the Plan, and have the meaning set forth in the Plan. This Agreement and the Plan constitute the entire understanding between you and the Company regarding the SARs. Any prior agreements, commitments or negotiations concerning the SARs are superseded.
Consent to Electronic Delivery	The Company may choose to deliver certain statutory materials relating to the Plan in electronic form. By accepting the SARs you agree that the Company may deliver the Plan prospectus and the Company’s annual report to you in an electronic format. If at any time you would prefer to receive paper copies of these documents, as you are entitled to, the Company would be pleased to provide copies. Please contact Corporate Human Resources to request paper copies of these documents.

By signing the cover sheet of this Agreement, you agree to all of the terms and conditions described above and in the Plan.

EX-31.1

Exhibit 31.1

CERTIFICATION

I, James E. Cline, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Trex Company, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent function(s)):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: May 5, 2017

/s/ James E. Cline

James E. Cline

President and Chief Executive Officer

(Principal Executive Officer)

EX-31.2

Exhibit 31.2

CERTIFICATION

I, Bryan H. Fairbanks, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Trex Company, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent function(s)):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: May 5, 2017

/s/ Bryan H. Fairbanks

Bryan H. Fairbanks

Vice President and Chief Financial Officer

(Principal Financial Officer)

EX-32

Exhibit 32

Certifications of Chief Executive Officer and Chief Financial Officer

Pursuant to Section 906

of the Sarbanes-Oxley Act of 2002 (18 U.S.C. Section 1350)

The undersigned, the President and Chief Executive Officer and the Vice President and Chief Financial Officer of Trex Company, Inc. (the “Company”), each hereby certifies that, on the date hereof:

(a) the Quarterly Report on Form 10-Q of the Company for the quarterly period ended March 31, 2017 filed on the date hereof with the U.S. Securities and Exchange Commission (the “Report”) fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(b) information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: May 5, 2017	/s/ James E. Cline
	James E. Cline
	President and Chief Executive Officer
Date: May 5, 2017	/s/ Bryan H. Fairbanks
	Bryan H. Fairbanks
	Vice President and Chief Financial Officer

XML

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2017	Apr. 21, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q1
Trading Symbol	TREX
Entity Registrant Name	TREX CO INC
Entity Central Index Key	0001069878
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		29,401,727

XML

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Net sales	$ 144,806	$ 131,676
Cost of sales	79,637	74,049
Gross profit	65,169	57,627
Selling, general and administrative expenses	23,269	20,612
Income from operations	41,900	37,015
Interest expense, net	204	572
Income before income taxes	41,696	36,443
Provision for income taxes	13,747	12,737
Net income	$ 27,949	$ 23,706
Basic earnings per common share	$ 0.95	$ 0.80
Basic weighted average common shares outstanding	29,363,210	29,697,722
Diluted earnings per common share	$ 0.95	$ 0.79
Diluted weighted average common shares outstanding	29,561,406	29,910,292
Comprehensive income	$ 27,949	$ 23,706

XML

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 1,767	$ 18,664
Accounts receivable, net	171,288	48,039
Inventories	30,109	28,546
Prepaid expenses and other assets	4,071	10,400
Total current assets	207,235	105,649
Property, plant and equipment, net	103,608	103,286
Goodwill and other intangibles	10,523	10,523
Other assets	1,940	1,972
Total assets	323,306	221,430
Current liabilities:
Accounts payable	13,643	10,767
Accrued expenses and other liabilities	31,108	34,693
Accrued warranty	5,925	5,925
Line of credit	77,000
Total current liabilities	127,676	51,385
Deferred income taxes	894	894
Non-current accrued warranty	30,757	31,767
Other long-term liabilities	3,045	3,223
Total liabilities	162,372	87,269
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.01 par value, 3,000,000 shares authorized; none issued and outstanding
Common stock, $0.01 par value, 80,000,000 shares authorized; 34,895,162 and 34,894,233 shares issued and 29,401,481 and 29,400,552 shares outstanding at March 31, 2017 and December 31, 2016, respectively	349	349
Additional paid-in capital	118,906	120,082
Retained earnings	215,191	187,242
Treasury stock, at cost, 5,493,681 shares at March 31, 2017 and December 31, 2016	(173,512)	(173,512)
Total stockholders' equity	160,934	134,161
Total liabilities and stockholders' equity	$ 323,306	$ 221,430

XML

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	3,000,000	3,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	80,000,000	80,000,000
Common stock, shares issued	34,895,162	34,894,233
Common stock, shares outstanding	29,401,481	29,400,552
Treasury stock, shares	5,493,681	5,493,681

XML

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating Activities
Net income	$ 27,949	$ 23,706
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	3,764	3,829
Stock-based compensation	1,965	1,276
Loss (gain) on disposal of property, plant and equipment	258	(105)
Changes in operating assets and liabilities:
Accounts receivable	(123,249)	(108,939)
Inventories	(1,563)	(2,556)
Prepaid expenses and other assets	2,304	(1,577)
Accounts payable	2,876	(666)
Accrued expenses and other liabilities	(13,939)	(11,327)
Income taxes receivable/payable	13,191	12,239
Net cash used in operating activities	(86,444)	(84,120)
Investing Activities
Expenditures for property, plant and equipment	(4,312)	(2,439)
Proceeds from sales of property, plant and equipment		4,249
Net cash (used in) provided by investing activities	(4,312)	1,810
Financing Activities
Borrowings under line of credit	93,000	148,500
Principal payments under line of credit	(16,000)	(14,000)
Repurchases of common stock	(3,244)	(53,968)
Financing costs		(485)
Proceeds from employee stock purchase and option plans	103	72
Net cash provided by financing activities	73,859	80,119
Net decrease in cash and cash equivalents	(16,897)	(2,191)
Cash and cash equivalents, beginning of period	18,664	5,995
Cash and cash equivalents, end of period	1,767	3,804
Supplemental Disclosure:
Cash paid for interest	64	248
Cash paid for income taxes, net	$ 556	$ 498

XML

Business and Organization

3 Months Ended

Mar. 31, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Business and Organization

1. BUSINESS AND ORGANIZATION

Trex Company, Inc. (Company) is the world’s largest manufacturer of wood-alternative decking and railing products, which are marketed under the brand name Trex^®. The Company manufactures and distributes high-performance, low-maintenance wood/plastic composite outdoor living products and related accessories. A majority of its products are manufactured in a proprietary process that combines reclaimed wood fibers and scrap polyethylene. The Company is incorporated in Delaware. The principal executive offices are located at 160 Exeter Drive, Winchester, Virginia 22603, and the telephone number at that address is (540) 542-6300. The Company operates in a single reportable segment.

XML

Basis of Presentation

3 Months Ended

Mar. 31, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

2. BASIS OF PRESENTATION

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, the accompanying condensed consolidated financial statements do not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements. In the opinion of management, all adjustments (consisting of normal and recurring adjustments except as otherwise described herein) considered necessary for a fair presentation have been included in the accompanying condensed consolidated financial statements. Certain prior period amounts have been reclassified to conform to current period presentation. The consolidated results of operations for the three months ended March 31, 2017 are not necessarily indicative of the results that may be expected for the fiscal year ending December 31, 2017. These condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements as of December 31, 2016 and 2015 and for each of the three years in the period ended December 31, 2016 included in the Annual Report of Trex Company, Inc. on Form 10-K, as filed with the U.S. Securities and Exchange Commission.

The Company’s critical accounting policies are included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016.

XML

Recently Adopted Accounting Standard

3 Months Ended

Mar. 31, 2017

Accounting Changes and Error Corrections [Abstract]

Recently Adopted Accounting Standard

3. RECENTLY ADOPTED ACCOUNTING STANDARD

In March 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2016-09, “Compensation – Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting.” The standard amends certain aspects of accounting for employee share-based payment transactions, including the accounting for income taxes related to those transactions and forfeitures. The standard requires recognizing excess tax benefits and deficiencies on share-based awards in the tax provision instead of in equity. Also, the standard requires these amounts to be classified as an operating activity, and shares withheld to satisfy employee taxes to be classified as a financing activity in the statement of cash flows, rather than as currently classified as financing and operating activities, respectively. The standard was effective for annual reporting periods beginning after December 15, 2016 and interim periods within that reporting period, with early adoption permitted. The Company elected to early adopt the standard in fiscal year 2016. The impact of the early adoption resulted in the following:

• The standard requires that excess tax benefits of the settlement or vesting of time-based restricted stock or time-based restricted stock units and performance-based restricted stock or performance-based restricted stock units be recorded within income tax expense. Prior to adoption this amount would have been recorded as an increase in additional paid-in capital. Additionally, the standard requires that excess tax benefits are now reported as an operating activity in the Company’s Consolidated Statements of Cash Flows, rather than as a financing activity as was previously reported. The Company applied this guidance prospectively as of January 1, 2016 during the quarterly period ended December 31, 2016, and, accordingly, data previously reported for the quarterly period ended March 31, 2016 has been adjusted, as follows:

	Three Months Ended March 31, 2016
	As Reported			Adjusted
	(in thousands, except share and per share data)
Provision for income taxes	$	13,041		$	12,737
Net Income	$	23,402		$	23,706
Basic net income per share	$	0.79		$	0.80
Diluted net income per share	$	0.78		$	0.79
Diluted weighted average common shares outstanding		29,860,730			29,910,292
Cash flows from operating activities	$	(84,483	)	$	(84,120	)
Cash flows from financing activities	$	80,482		$	80,119

• The Company elected to change its policy on accounting for forfeitures and recognize forfeitures as they occur. The Company applied this guidance on a modified retrospective transition method. The Company determined that the cumulative effect of applying the guidance under the modified retrospective transition method was not material to its Consolidated Financial Statements.

• The standard requires the presentation of employee taxes as a financing activity in the Consolidated Statements of Cash Flows. This provision did not impact the Company’s Consolidated Financial Statements as the Company presented employee taxes as a financing activity in its Consolidated Statements of Cash Flows.

The Company excluded the excess tax benefits from the assumed proceeds available to repurchase shares in the computation of diluted earnings per share for 2016, which did not materially increase the diluted weighted average common shares outstanding.

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New Accounting Standards Not Yet Adopted

3 Months Ended

Mar. 31, 2017

Accounting Changes and Error Corrections [Abstract]

New Accounting Standards Not Yet Adopted

4. NEW ACCOUNTING STANDARDS NOT YET ADOPTED

In January 2017, the FASB issued ASU No. 2017-04, “Intangibles—Goodwill and Other (Topic 350), Simplifying the Test for Goodwill Impairment.” The guidance removes Step 2 of the goodwill impairment test and eliminates the need to determine the fair value of individual assets and liabilities to measure goodwill impairment. A goodwill impairment will now be the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. Entities will continue to have the option to perform a qualitative assessment to determine if a quantitative impairment test is necessary. The guidance is to be applied prospectively, and is effective for annual and interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Early adoption is permitted for any impairment tests performed on testing dates after January 1, 2017. The Company intends to adopt the guidance on the effective date and does not believe adoption will have a material impact on its financial condition or results of operations.

In August 2016, the FASB issued ASU No. 2016-15, “Statement of Cash flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments.” The guidance is intended to reduce diversity in practice across all industries in how certain transactions are classified in the statement of cash flows. The guidance is effective for financial statements issued for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted. The guidance requires application using a retrospective translation method. The Company intends to adopt the guidance on the effective date and does not believe adoption will have a material impact on its consolidated financial statements.

In February 2016, the FASB issued ASU No. 2016-02, “Leases (Topic 842).” The standard requires lessees to recognize leases on the balance sheet as a right-of-use asset and a lease liability, other than leases that meet the definition of a short-term lease. The liability will be equal to the present value of the lease payments. The asset will be based on the liability, subject to adjustment. For income statement purposes, the leases will continue to be classified as either operating or finance. Operating leases will result in straight-line expense (similar to current operating leases) and finance leases will result in a front-loaded expense pattern (similar to current capital leases). The standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Early adoption is permitted. The standard must be adopted using the modified retrospective transition method and provides for the option to elect a package of practical expedients upon adoption. The Company intends to adopt the standard in the first quarter of fiscal 2019, and is currently assessing the impact of adoption of the standard on its consolidated financial statements and related note disclosures. The Company has not made any decision on the option to elect adoption of the practical expedients.

In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers,” and issued subsequent amendments to the initial guidance in August 2015 within ASU No. 2015-14, in March 2016 within ASU No. 2016-08, in April 2016 within ASU No. 2016-10, in May 2016 within ASU No. 2016-12, and in December 2016 within ASU No. 2016-20 (collectively, the new standard). The new standard provides a single, comprehensive model for revenue arising from contracts with customers and supersedes most current revenue recognition guidance. The new standard requires an entity to

recognize revenue at an amount that reflects the consideration to which the entity expects to be entitled in exchange for transferring goods or services to a customer. The Company intends to adopt the new standard in the first quarter of fiscal 2018. Currently, the Company intends to use the retrospective application to each reporting period presented, with the option to elect certain practical expedients as defined in the new standard. The Company does not believe adoption of the new standard will have a material impact on its Consolidated Statements of Comprehensive Income, but expects expanded financial statement footnote disclosure. The Company is continuing to evaluate the impacts of the pending adoption. As such, the Company’s preliminary assessments are subject to change.

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Inventories

3 Months Ended

Mar. 31, 2017

Inventory Disclosure [Abstract]

Inventories

5. INVENTORIES

Inventories, at LIFO (last-in, first-out) value, consist of the following (in thousands):

	March 31, 2017			December 31, 2016
Finished goods	$	31,652		$	29,686
Raw materials		19,828			20,231
Total FIFO (first-in, first-out) inventories		51,480			49,917
Reserve to adjust inventories to LIFO value		(21,371	)		(21,371	)
Total LIFO inventories	$	30,109		$	28,546

The Company utilizes the LIFO method of accounting for inventory, which generally provides for the matching of current costs with current revenues. However, under the LIFO method, reductions in annual inventory balances cause a portion of the Company’s cost of sales to be based on historical costs rather than current year costs (LIFO liquidation). Reductions in interim inventory balances expected to be replenished by year-end do not result in a LIFO liquidation. Accordingly, interim LIFO calculations are based, in part, on management’s estimates of expected year-end inventory levels and costs which may differ from actual results. Since inventory levels and costs are subject to factors beyond management’s control, interim results are subject to the final year-end LIFO inventory valuation. There were no LIFO inventory liquidations or related impact on cost of sales in the three months ended March 31, 2017 or 2016.

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Prepaid Expenses and Other Assets

3 Months Ended

Mar. 31, 2017

Text Block [Abstract]

Prepaid Expenses and Other Assets

6. PREPAID EXPENSES AND OTHER ASSETS

Prepaid expenses and other assets consist of the following (in thousands):

	March 31, 2017		December 31, 2016
Prepaid expenses	$	3,904	$	6,209
Income tax receivable		—		4,024
Other		167		167
Total prepaid expenses and other assets	$	4,071	$	10,400

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Accrued Expenses and Other Liabilities

3 Months Ended

Mar. 31, 2017

Payables and Accruals [Abstract]

Accrued Expenses and Other Liabilities

7. ACCRUED EXPENSES AND OTHER LIABILITIES

Accrued expenses and other liabilities consist of the following (in thousands):

	March 31, 2017		December 31, 2016
Sales and marketing	$	13,408	$	16,707
Compensation and benefits		3,662		13,298
Income taxes		9,167		—
Manufacturing costs		1,734		1,799
Rent obligations		668		632
Other		2,469		2,257
Total accrued expenses and other liabilities	$	31,108	$	34,693

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Debt

3 Months Ended

Mar. 31, 2017

Debt Disclosure [Abstract]

Debt

8. DEBT

The Company’s outstanding debt consists of a revolving credit facility.

Revolving Credit Facility

Through January 11, 2016, the Company’s Second Amended and Restated Credit Agreement provided the Company with one or more revolving loans in a collective maximum principal amount of $150 million from January 1 through June 30 of each year, and a maximum principal amount of $100 million from July 1 through December 31 of each year.

On January 12, 2016, the Company entered into a Third Amended and Restated Credit Agreement, as amended, with Bank of America, N.A. as Lender, Administrative Agent, Swing Line Lender and Letter of Credit Issuer, and certain other lenders including Citibank, N.A., Capital One, N.A., and SunTrust. The Third Amended Credit Agreement, as amended, provides the Company with one or more revolving loans in a collective maximum principal amount of $250 million from January 1 through June 30 of each year, and a maximum principal amount of $200 million from July 1 through December 31 of each year throughout the term, which ends January 12, 2021.

The Company had $77 million in outstanding borrowings under its revolving credit facility and remaining available borrowing capacity of $173 million at March 31, 2017.

Compliance with Debt Covenants and Restrictions

The Company’s ability to make scheduled principal and interest payments, borrow and repay amounts under any outstanding revolving credit facility and continue to comply with any loan covenants depends primarily on the Company’s ability to generate sufficient cash flow from operations.

As of March 31, 2017, the Company was in compliance with all of the covenants contained in its debt agreements. Failure to comply with the loan covenants might cause lenders to accelerate the repayment obligations under the credit facility, which may be declared payable immediately based on a default.

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Financial Instruments

3 Months Ended

Mar. 31, 2017

Investments, All Other Investments [Abstract]

Financial Instruments

9. FINANCIAL INSTRUMENTS

The Company considers the recorded value of its financial assets and liabilities, consisting primarily of cash and cash equivalents, accounts receivable, accounts payable, accrued expenses and other current liabilities to approximate the fair value of the respective assets and liabilities at March 31, 2017 and December 31, 2016.

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Stockholders' Equity

3 Months Ended

Mar. 31, 2017

Equity [Abstract]

Stockholders' Equity

10. STOCKHOLDERS’ EQUITY

Earnings Per Share

The following table sets forth the computation of basic and diluted earnings per share (in thousands, except share and per share data):

	Three Months Ended March 31,
	2017		2016
Numerator:
Net income available to common shareholders	$	27,949	$	23,706
Denominator:
Basic weighted average shares outstanding		29,363,210		29,697,722
Effect of dilutive securities:
Stock appreciation rights and options		100,585		148,047
Restricted stock		97,611		64,523
Diluted weighted average shares outstanding		29,561,406		29,910,292
Basic earnings per share	$	0.95	$	0.80
Diluted earnings per share	$	0.95	$	0.79

Diluted earnings per share is computed using the weighted average number of shares determined for the basic earnings per share computation plus the dilutive effect of common stock equivalents using the treasury stock method. The computation of diluted earnings per share excludes the following potentially dilutive securities because the effect would be anti-dilutive:

	Three Months Ended March 31,
	2017		2016
Stock appreciation rights		8,170		18,523

Stock Repurchase Programs

On October 22, 2015, the Board of Directors adopted a stock repurchase program of up to 3,150,000 shares of the Company’s outstanding common stock (October 2015 Stock Repurchase Program). This authorization terminated on December 31, 2016. The Company had repurchased 1,578,952 shares for $53.3 million under the October 2015 Stock Repurchase Program.

On February 16, 2017, the Board of Directors authorized a common stock repurchase program of up to 2,960,000 shares of the Company’s outstanding common stock (February 2017 Stock Repurchase Program). As of the date of this report, the Company has made no repurchases under the February 2017 Stock Repurchase Program.

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Stock-Based Compensation

3 Months Ended

Mar. 31, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation

11. STOCK-BASED COMPENSATION

The Company has one stock-based compensation plan, the 2014 Stock Incentive Plan (Plan), approved by the Company’s stockholders in April 2014. The Plan amended and restated in its entirety the Trex Company, Inc. 2005 Stock Incentive Plan. The Plan is administered by the Compensation Committee of the Company’s Board of Directors. Stock-based compensation is granted to officers, directors and certain key employees in accordance with the provisions of the Plan. The Plan provides for grants of stock options, restricted stock, restricted stock units, stock appreciation rights (SARs), and unrestricted stock. As of March 31, 2017, the total aggregate number of shares of the Company’s common stock that may be issued under the Plan is 6,420,000.

In 2014, the Company began granting performance-based restricted stock in addition to the time-based restricted stock it previously granted. The performance-based restricted shares have a three-year vesting period, vesting one-third each year based on target earnings before interest, taxes, depreciation and amortization for 1 year, cumulative 2 years and cumulative 3 years, respectively. The number of shares that vest, with respect to each vesting, will be between 0% and 200% of the target number of shares.

In 2015, the Company began issuing restricted stock units in lieu of restricted stock. Accordingly, time-based restricted stock units replaced time-based restricted stock and performance-based restricted stock units replaced performance-based restricted stock. The vesting terms of the restricted stock units are identical to the vesting provisions of the restricted stock.

The fair value of each SAR is estimated on the date of grant using a Black-Scholes option-pricing formula. There were no SARs issued during the three months ended March 31, 2016. For SARs issued in the three months ended March 31, 2017 the data and assumptions shown in the following table were used:

	Three Months Ended March 31, 2017
Weighted-average fair value of grants	$	27.81
Dividend yield		0	%
Average risk-free interest rate		2.0	%
Expected term (years)		5
Expected volatility		42	%

The following table summarizes the Company’s stock-based compensation grants for the three months ended March 31, 2017:

	Stock Awards Granted		Weighted-Average Grant Price Per Share
Time-based restricted stock units		19,391	$	70.07
Performance-based restricted stock units (a)		40,216	$	56.19
Stock appreciation rights		16,340	$	70.09

(a) Includes 22,895 of target performance-based restricted stock unit awards granted during the three months ended March 31, 2017, and adjustments of 1,071, 5,396, and 10,854 grants due to the actual performance level achieved for restricted stock and restricted stock units awarded in 2014, 2015, and 2016, respectively.

The Company recognizes stock-based compensation expense ratably over the period from the grant date to the earlier of: (1) the vesting date of the award, or (2) the date the grantee is eligible to retire without forfeiting the award. For performance-based restricted stock and performance-based restricted stock units, expense is recognized ratably over the performance and vesting period of each tranche based on management’s judgment of the ultimate award that is likely to be paid out based on the achievement of the predetermined performance measures. The following table summarizes the Company’s stock-based compensation expense (in thousands):

	Three Months Ended March 31,
	2017		2016
Stock appreciation rights	$	167	$	109
Time-based restricted stock and units		737		616
Performance-based restricted stock and units		1,039		511
Employee stock purchase plan		22		40
Total stock-based compensation	$	1,965	$	1,276

Total unrecognized compensation cost related to unvested awards as of March 31, 2017 was $5.1 million. The cost of these unvested awards is being recognized over the requisite vesting period of each award.

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Income Taxes

3 Months Ended

Mar. 31, 2017

Income Tax Disclosure [Abstract]

Income Taxes

12. INCOME TAXES

The Company’s effective tax rate for the three months ended March 31, 2017 and 2016 was 33.0% and 35.0%, respectively, which resulted in expense of $13.7 million and $12.7 million, respectively. The difference of 2.0% in the effective tax rate was primarily due to higher excess tax benefits recognized in income tax expense during the three months ended March 31, 2017 compared to the same period in 2016. In fiscal year 2016, the Company adopted FASB ASU No. 2016-09, “Compensation – Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting.” The new standard requires excess tax benefits on share-based awards be recognized in the tax provision instead of in equity.

During the three months ended March 31, 2017 and March 31, 2016, the Company realized $1.0 million and $0.4 million, respectively, of excess tax benefits from stock-based awards and recorded a corresponding benefit to income tax expense.

The Company analyzes its deferred tax assets each reporting period, considering all available positive and negative evidence in determining the expected realization of those deferred tax assets. As of March 31, 2017, the Company maintains a valuation allowance of $4.1 million against deferred tax assets primarily related to state tax credits it estimates will expire before they are realized.

The Company operates in multiple tax jurisdictions and, in the normal course of business, its tax returns are subject to examination by various taxing authorities. Such examinations may result in future assessments by these taxing authorities, and the Company accrues a liability when it believes that it is more likely than not that benefits of tax positions will not be realized. The Company believes that adequate provisions have been made for all tax returns subject to examination. As of March 31, 2017, Federal tax years 2013 through 2016 remain subject to examination. Sales made to foreign distributors are not taxable in any foreign jurisdictions as the Company does not have a taxable presence in any foreign jurisdiction.

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Seasonality

3 Months Ended

Mar. 31, 2017

Text Block [Abstract]

Seasonality

13. SEASONALITY

The Company’s operating results have historically varied from quarter to quarter. Seasonal, erratic or prolonged adverse weather conditions in certain geographic regions during the first and fourth quarters reduce the level of home improvement and construction activity and can shift demand for Trex products to a later period. As part of its normal business practice and consistent with industry practice, the Company has historically offered incentive programs to its distributors and dealers to build inventory levels before the start of the prime deck-building season in order to ensure adequate availability of the Company’s product to meet anticipated seasonal consumer demand. The seasonal effects experienced during the first and fourth quarters are often offset by the positive effect of the incentive programs.

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

14. COMMITMENTS AND CONTINGENCIES

Contract Termination Costs

The Company leases 55,047 square feet of office and storage space that it does not occupy, but has sublet all of the office space for the remainder of the term of its lease obligation, which ends June 30, 2019. The Company estimates that the future sublease receipts will be less than the remaining minimum lease payment obligations under its lease and has recorded a liability for the present value of the expected shortfall.

As of March 31, 2017, minimum payments remaining under the Company’s lease relating to its reconsidered corporate relocation over the years ending December 31, 2017, 2018, and 2019 are $1.4 million, $2.0 million and $1.1 million, respectively. Net minimum receipts remaining under the Company’s existing subleases over the years ending December 31, 2017, 2018 and 2019 are $1.0 million, $1.3 million and $0.7 million, respectively.

The following table provides information about the Company’s liability related to the lease (in thousands):

	2017			2016
Beginning balance, January 1	$	1,475		$	2,106
Net rental payments		(156	)		(248	)
Accretion of discount		28			40
Ending balance, March 31	$	1,347		$	1,898

Product Warranty

The Company warrants that its products will be free from material defects in workmanship and materials. This warranty generally extends for a period of 25 years for residential use and 10 years for commercial use, excluding TrexTrim™ and Trex Reveal^® Railing, which have a warranty period of 25 years for both residential and commercial use. The Company further warrants that Trex Transcend^®, Trex Enhance^®, Trex Select^® and Universal Fascia products will not fade in color more than a certain amount and will be resistant to permanent staining from food substances or mold, provided the stain is cleaned within seven days of appearance. This warranty extends for a period of 25 years for residential use and 10 years for commercial use. If there is a breach of such warranties, the Company has an obligation either to replace the defective product or refund the purchase price.

The Company continues to receive and settle claims for products manufactured at its Nevada facility prior to 2007 that exhibit surface flaking and maintains a warranty reserve to provide for the settlement of these claims. Estimating the warranty reserve for surface flaking claims requires management to estimate (1) the number of claims to be settled with payment and (2) the average cost to settle each claim.

To estimate the number of claims to be settled with payment, the Company utilizes actuarial techniques to quantify both the expected number of claims to be received and the percentage of those claims that will ultimately require payment (collectively, elements). Estimates for these elements are quantified using a range of assumptions derived from claim count history and the identification of factors influencing the claim counts. The number of claims received has declined each year since peaking in 2009, although the rate of decline has decelerated in recent years. Additionally, events, such as the 2009 settlement of a class action lawsuit covering the surface defect and communications by the Company in 2013 informing homeowners of potential hazards associated with products exhibiting surface flaking that are not timely replaced, have obscured observable trends in historical claims activity. The cost per claim varies due to a number of factors, including the size of affected decks, the availability and type of replacement material used, the cost of production of replacement material and the method of claim settlement.

The Company monitors surface flaking claims activity each quarter for indications that its estimates require revision. Typically, a majority of surface flaking claims received in a year are received during the summer outdoor season, which spans the second and third quarters. It has been the Company’s practice to utilize the actuarial techniques discussed above during the third quarter, after a significant portion of all claims has been received for the fiscal year and variances to annual claims expectations are more meaningful. The number of claims received in the three months ended March 31, 2017 was lower than claims received in the three months ended March 31, 2016, continuing the historical year-over-year decline in incoming claims, but slightly higher than the Company’s expectations. The average settlement cost per claim experienced in the three months ended March 31, 2017 was higher than the average settlement cost per claim experienced during the three months ended March 31, 2016 and higher than the Company’s expectations for 2017. Continued settlement of claims at this elevated cost may require additional increases in the Company’s surface flaking reserve. However, the Company believes its reserve at March 31, 2017 is sufficient to cover future surface flaking obligations.

The Company’s analysis is based on currently known facts and a number of assumptions, as discussed above, and current expectations. Projecting future events such as the number of claims to be received, the number of claims that will require payment and the average cost of claims could cause the actual warranty liabilities to be higher or lower than those projected, which could materially affect the Company’s financial condition, results of operations or cash flows. The Company estimates that the annual number of claims received will continue to decline over time and that the average cost per claim will increase slightly, primarily due to inflation. If the level of claims received or average cost per claim differs materially from expectations, it could result in additional increases or decreases to the warranty reserve and a decrease or increase in earnings and cash flows in future periods. The Company estimates that a 10% change in the expected number of remaining claims to be settled with payment or the expected cost to settle claims may result in approximately a $3.3 million change in the surface flaking warranty reserve.

The following is a reconciliation of the Company’s warranty reserve that represents amounts accrued for surface flaking claims (in thousands):

	2017			2016
Beginning balance, January 1	$	33,847		$	29,673
Changes in estimates related to pre-existing warranties		—			—
Settlements made during the period		(1,114	)		(1,074	)
Ending balance, March 31	$	32,733		$	28,599

The remainder of the Company’s warranty reserve represents amounts accrued for non-surface flaking claims.

Legal Matters

The Company has lawsuits, as well as other claims, pending against it which are ordinary routine litigation and claims incidental to the business. Management has evaluated the merits of these lawsuits and claims, and believes that their ultimate resolution will not have a material effect on the Company’s consolidated financial condition, results of operations, liquidity or competitive position.

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Financial Instruments (Policies)

3 Months Ended

Mar. 31, 2017

Investments, All Other Investments [Abstract]

Financial Instruments

The Company considers the recorded value of its financial assets and liabilities, consisting primarily of cash and cash equivalents, accounts receivable, accounts payable, accrued expenses and other current liabilities to approximate the fair value of the respective assets and liabilities at March 31, 2017 and December 31, 2016.

Share-based Compensation

The Company has one stock-based compensation plan, the 2014 Stock Incentive Plan (Plan), approved by the Company’s stockholders in April 2014. The Plan amended and restated in its entirety the Trex Company, Inc. 2005 Stock Incentive Plan. The Plan is administered by the Compensation Committee of the Company’s Board of Directors. Stock-based compensation is granted to officers, directors and certain key employees in accordance with the provisions of the Plan. The Plan provides for grants of stock options, restricted stock, restricted stock units, stock appreciation rights (SARs), and unrestricted stock. As of March 31, 2017, the total aggregate number of shares of the Company’s common stock that may be issued under the Plan is 6,420,000.

In 2014, the Company began granting performance-based restricted stock in addition to the time-based restricted stock it previously granted. The performance-based restricted shares have a three-year vesting period, vesting one-third each year based on target earnings before interest, taxes, depreciation and amortization for 1 year, cumulative 2 years and cumulative 3 years, respectively. The number of shares that vest, with respect to each vesting, will be between 0% and 200% of the target number of shares.

In 2015, the Company began issuing restricted stock units in lieu of restricted stock. Accordingly, time-based restricted stock units replaced time-based restricted stock and performance-based restricted stock units replaced performance-based restricted stock. The vesting terms of the restricted stock units are identical to the vesting provisions of the restricted stock.

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Recently Adopted Accounting Standard (Tables)

3 Months Ended

Mar. 31, 2017

Accounting Changes and Error Corrections [Abstract]

Schedule of Previously Reported Quarterly Data

The Company applied this guidance prospectively as of January 1, 2016 during the quarterly period ended December 31, 2016, and, accordingly, data previously reported for the quarterly period ended March 31, 2016 has been adjusted, as follows:

	Three Months Ended March 31, 2016
	As Reported			Adjusted
	(in thousands, except share and per share data)
Provision for income taxes	$	13,041		$	12,737
Net Income	$	23,402		$	23,706
Basic net income per share	$	0.79		$	0.80
Diluted net income per share	$	0.78		$	0.79
Diluted weighted average common shares outstanding		29,860,730			29,910,292
Cash flows from operating activities	$	(84,483	)	$	(84,120	)
Cash flows from financing activities	$	80,482		$	80,119

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Inventories (Tables)

3 Months Ended

Mar. 31, 2017

Inventory Disclosure [Abstract]

Summary of Inventories, at LIFO Value

Inventories, at LIFO (last-in, first-out) value, consist of the following (in thousands):

	March 31, 2017			December 31, 2016
Finished goods	$	31,652		$	29,686
Raw materials		19,828			20,231
Total FIFO (first-in, first-out) inventories		51,480			49,917
Reserve to adjust inventories to LIFO value		(21,371	)		(21,371	)
Total LIFO inventories	$	30,109		$	28,546

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Prepaid Expenses and Other Assets (Tables)

3 Months Ended

Mar. 31, 2017

Text Block [Abstract]

Summary of Prepaid Expenses and Other Assets

Prepaid expenses and other assets consist of the following (in thousands):

	March 31, 2017		December 31, 2016
Prepaid expenses	$	3,904	$	6,209
Income tax receivable		—		4,024
Other		167		167
Total prepaid expenses and other assets	$	4,071	$	10,400

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Accrued Expenses and Other Liabilities (Tables)

3 Months Ended

Mar. 31, 2017

Payables and Accruals [Abstract]

Summary of Accrued Expenses and Other Liabilities

Accrued expenses and other liabilities consist of the following (in thousands):

	March 31, 2017		December 31, 2016
Sales and marketing	$	13,408	$	16,707
Compensation and benefits		3,662		13,298
Income taxes		9,167		—
Manufacturing costs		1,734		1,799
Rent obligations		668		632
Other		2,469		2,257
Total accrued expenses and other liabilities	$	31,108	$	34,693

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Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2017

Equity [Abstract]

Computation of Basic and Diluted Earnings Per Share

The following table sets forth the computation of basic and diluted earnings per share (in thousands, except share and per share data):

	Three Months Ended March 31,
	2017		2016
Numerator:
Net income available to common shareholders	$	27,949	$	23,706
Denominator:
Basic weighted average shares outstanding		29,363,210		29,697,722
Effect of dilutive securities:
Stock appreciation rights and options		100,585		148,047
Restricted stock		97,611		64,523
Diluted weighted average shares outstanding		29,561,406		29,910,292
Basic earnings per share	$	0.95	$	0.80
Diluted earnings per share	$	0.95	$	0.79

Antidilutive Securities Excluded from Computation of Earnings Per Share

The computation of diluted earnings per share excludes the following potentially dilutive securities because the effect would be anti-dilutive:

	Three Months Ended March 31,
	2017		2016
Stock appreciation rights		8,170		18,523

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Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Assumptions Used to Estimate Fair Value of Each SAR

The fair value of each SAR is estimated on the date of grant using a Black-Scholes option-pricing formula. There were no SARs issued during the three months ended March 31, 2016. For SARs issued in the three months ended March 31, 2017 the data and assumptions shown in the following table were used:

	Three Months Ended March 31, 2017
Weighted-average fair value of grants	$	27.81
Dividend yield		0	%
Average risk-free interest rate		2.0	%
Expected term (years)		5
Expected volatility		42	%

Summary of Stock-Based Compensation Grants

The following table summarizes the Company’s stock-based compensation grants for the three months ended March 31, 2017:

	Stock Awards Granted		Weighted-Average Grant Price Per Share
Time-based restricted stock units		19,391	$	70.07
Performance-based restricted stock units (a)		40,216	$	56.19
Stock appreciation rights		16,340	$	70.09

(a) Includes 22,895 of target performance-based restricted stock unit awards granted during the three months ended March 31, 2017, and adjustments of 1,071, 5,396, and 10,854 grants due to the actual performance level achieved for restricted stock and restricted stock units awarded in 2014, 2015, and 2016, respectively.

Summary of Stock-Based Compensation Expense

The following table summarizes the Company’s stock-based compensation expense (in thousands):

	Three Months Ended March 31,
	2017		2016
Stock appreciation rights	$	167	$	109
Time-based restricted stock and units		737		616
Performance-based restricted stock and units		1,039		511
Employee stock purchase plan		22		40
Total stock-based compensation	$	1,965	$	1,276

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Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Summary of Liability Related to Lease

The following table provides information about the Company’s liability related to the lease (in thousands):

	2017			2016
Beginning balance, January 1	$	1,475		$	2,106
Net rental payments		(156	)		(248	)
Accretion of discount		28			40
Ending balance, March 31	$	1,347		$	1,898

Summary of Reconciliation of Company's Warranty Reserve that Represents Amounts Accrued for Surface Flaking Claims

The following is a reconciliation of the Company’s warranty reserve that represents amounts accrued for surface flaking claims (in thousands):

	2017			2016
Beginning balance, January 1	$	33,847		$	29,673
Changes in estimates related to pre-existing warranties		—			—
Settlements made during the period		(1,114	)		(1,074	)
Ending balance, March 31	$	32,733		$	28,599

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Business and Organization - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2017 Segment
Accounting Policies [Abstract]
Number of reportable segments	1

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Recently Adopted Accounting Standard - Schedule of Previously Reported Quarterly Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Provision for income taxes	$ 13,747	$ 12,737
Net income	$ 27,949	$ 23,706
Basic net income per share	$ 0.95	$ 0.80
Diluted net income per share	$ 0.95	$ 0.79
Diluted weighted average common shares outstanding	29,561,406	29,910,292
Cash flows from operating activities	$ (86,444)	$ (84,120)
Cash flows from financing activities	$ 73,859	80,119
As Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Provision for income taxes		13,041
Net income		$ 23,402
Basic net income per share		$ 0.79
Diluted net income per share		$ 0.78
Diluted weighted average common shares outstanding		29,860,730
Cash flows from operating activities		$ (84,483)
Cash flows from financing activities		$ 80,482

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Inventories - Summary of Inventories, at LIFO Value (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Finished goods	$ 31,652	$ 29,686
Raw materials	19,828	20,231
Total FIFO (first-in, first-out) inventories	51,480	49,917
Reserve to adjust inventories to LIFO value	(21,371)	(21,371)
Total LIFO inventories	$ 30,109	$ 28,546

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Inventories - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Inventory Disclosure [Abstract]
LIFO inventory liquidations	$ 0	$ 0

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Prepaid Expenses and Other Assets - Summary of Prepaid Expenses and Other Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Prepaid Expense and Other Assets [Abstract]
Prepaid expenses	$ 3,904	$ 6,209
Income tax receivable		4,024
Other	167	167
Total prepaid expenses and other assets	$ 4,071	$ 10,400

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Accrued Expenses and Other Liabilities - Summary of Accrued Expenses and Other Liabilities (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Sales and marketing	$ 13,408	$ 16,707
Compensation and benefits	3,662	13,298
Income taxes	9,167
Manufacturing costs	1,734	1,799
Rent obligations	668	632
Other	2,469	2,257
Total accrued expenses and other liabilities	$ 31,108	$ 34,693

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Debt - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2017 USD ($)
Line of Credit Facility [Line Items]
Outstanding borrowings under the revolver loans	$ 77,000,000
Remaining available borrowing capacity	$ 173,000,000
Third Amended and Restated Credit Agreement [Member]
Line of Credit Facility [Line Items]
Termination date of the Credit Agreement	Jan. 12, 2021
Revolver Loans Portion Effective January 1 through June 30 [Member] | Second Amended and Restated Credit Agreement [Member]
Line of Credit Facility [Line Items]
Revolving loans in a collective maximum principal amount	$ 150,000,000
Revolver Loans Portion Effective January 1 through June 30 [Member] | Third Amended and Restated Credit Agreement [Member]
Line of Credit Facility [Line Items]
Revolving loans in a collective maximum principal amount	250,000,000
Revolver Loans Portion Effective July 1 through December 31 [Member] | Second Amended and Restated Credit Agreement [Member]
Line of Credit Facility [Line Items]
Revolving loans in a collective maximum principal amount	100,000,000
Revolver Loans Portion Effective July 1 through December 31 [Member] | Third Amended and Restated Credit Agreement [Member]
Line of Credit Facility [Line Items]
Revolving loans in a collective maximum principal amount	$ 200,000,000

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Stockholders' Equity - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Numerator:
Net income available to common shareholders	$ 27,949	$ 23,706
Denominator:
Basic weighted average shares outstanding	29,363,210	29,697,722
Effect of dilutive securities:
Diluted weighted average shares outstanding	29,561,406	29,910,292
Basic earnings per share	$ 0.95	$ 0.80
Diluted earnings per share	$ 0.95	$ 0.79
Stock Appreciation Rights and Options [Member]
Effect of dilutive securities:
Dilutive securities	100,585	148,047
Restricted Stock [Member]
Effect of dilutive securities:
Dilutive securities	97,611	64,523

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Stockholders' Equity - Antidilutive Securities Excluded from Computation of Earnings Per Share (Detail) - shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Stock Appreciation Rights [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from the computation of diluted earnings per share	8,170	18,523

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Stockholders' Equity - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Feb. 16, 2017	Oct. 22, 2015
October 2015 Stock Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Common stock repurchase program, authorized shares			3,150,000
Common stock repurchase program, termination date	Dec. 31, 2016
Number of shares repurchased by the Company	1,578,952
Value of shares repurchased by the Company	$ 53.3
February 2017 Stock Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Common stock repurchase program, authorized shares		2,960,000
Number of shares repurchased by the Company	0

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Stock-Based Compensation - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($) Plan shares	Mar. 31, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock based compensation plans | Plan	1
Unrecognized compensation cost related to unvested awards | $	$ 5.1
2014 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total aggregate number of shares of common stock that may be issued	6,420,000
Performance-Based Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Performance-Based Restricted Stock [Member] | Share-Based Compensation Award, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based Compensation vesting percentage	33.33%
Performance-Based Restricted Stock [Member] | Share-Based Compensation Award, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based Compensation vesting percentage	33.33%
Performance-Based Restricted Stock [Member] | Share-Based Compensation Award, Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based Compensation vesting percentage	33.33%
Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value assumptions method used	Black-Scholes option-pricing formula
Number of shares or rights issued	16,340	0
Minimum [Member] | Performance-Based Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target number of shares that will vest	0.00%
Maximum [Member] | Performance-Based Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target number of shares that will vest	200.00%

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Stock-Based Compensation - Summary of Assumptions Used to Estimate Fair Value of Each SAR (Detail) - Stock Appreciation Rights [Member]	3 Months Ended
	Mar. 31, 2017 $ / shares
Share Based Compensation Arrangement by Share Based Payment Award Fair Value Assumptions and Methodology [Line Items]
Weighted-average fair value of grants	$ 27.81
Dividend yield	0.00%
Average risk-free interest rate	2.00%
Expected term (years)	5 years
Expected volatility	42.00%

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Stock-Based Compensation - Summary of Stock-Based Compensation Grants (Detail) - $ / shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Time Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Awards Granted	19,391
Weighted-Average Grant Price Per Share	$ 70.07
Performance Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Awards Granted	40,216
Weighted-Average Grant Price Per Share	$ 56.19
Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Awards Granted	16,340	0
Weighted-Average Grant Price Per Share	$ 70.09

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Stock-Based Compensation - Summary of Stock-Based Compensation Grants (Parenthetical) (Detail) - shares	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Performance Based Restricted Stock Unit Target [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Awards Granted	22,895
Performance Based Restricted Stock Unit Adjustment [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Awards Granted		10,854	5,396	1,071

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Stock-Based Compensation - Summary of Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 1,965	$ 1,276
Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	167	109
Time-Based Restricted Stock and Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	737	616
Performance-Based Restricted Stock and Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	1,039	511
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 22	$ 40

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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Tax Contingency [Line Items]
Effective tax rate	33.00%	35.00%
Income tax expense (benefit)	$ 13,747	$ 12,737
Effective income tax rate reconciliation, percentage	2.00%	2.00%
Excess tax benefits from stock based awards	$ 1,000	$ 400
Valuation allowance	$ 4,100
Earliest Tax Year [Member] | Federal Tax Jurisdiction [Member]
Income Tax Contingency [Line Items]
Tax years subject to examination	2013
Latest Tax Year [Member] | Federal Tax Jurisdiction [Member]
Income Tax Contingency [Line Items]
Tax years subject to examination	2016

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Commitments and Contingencies - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($) ft²
Schedule Of Commitments And Contingencies [Line Items]
Change in warranty reserve for disclosure purposes only	$ 3.3
Surface Flaking Warranty Reserve [Member]
Schedule Of Commitments And Contingencies [Line Items]
Percentage change in warranty claims used as a threshold for disclosure	10.00%
Residential Use [Member]
Schedule Of Commitments And Contingencies [Line Items]
Warranty period	25 years
Commercial Use [Member]
Schedule Of Commitments And Contingencies [Line Items]
Warranty period	10 years
Transcend, Enhance, Select and Universal Fascia Product [Member] | Residential Use [Member]
Schedule Of Commitments And Contingencies [Line Items]
Warranty period	25 years
Transcend, Enhance, Select and Universal Fascia Product [Member] | Commercial Use [Member]
Schedule Of Commitments And Contingencies [Line Items]
Warranty period	10 years
TrexTrim and Trex Reveal Railing [Member] | Residential Use [Member]
Schedule Of Commitments And Contingencies [Line Items]
Warranty period	25 years
TrexTrim and Trex Reveal Railing [Member] | Commercial Use [Member]
Schedule Of Commitments And Contingencies [Line Items]
Warranty period	25 years
Sublease [Member]
Schedule Of Commitments And Contingencies [Line Items]
Net minimum receipts remaining under the Company's existing subleases for 2017	$ 1.0
Net minimum receipts remaining under the Company's existing subleases for 2018	1.3
Net minimum receipts remaining under the Company's existing subleases for 2019	$ 0.7
Contract Termination [Member]
Schedule Of Commitments And Contingencies [Line Items]
Lease square feet | ft²	55,047
Minimum payments, 2017	$ 1.4
Minimum payments, 2018	2.0
Minimum payments, 2019	$ 1.1

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Commitments and Contingencies - Summary of Liability Related to Lease (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Beginning balance	$ 1,475	$ 2,106
Net rental payments	(156)	(248)
Accretion of discount	28	40
Ending balance	$ 1,347	$ 1,898

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Commitments and Contingencies - Summary of Reconciliation of Company's Warranty Reserve that Represents Amounts Accrued for Surface Flaking Claims (Detail) - Surface Flaking Warranty Reserve [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Product Warranty Liability [Line Items]
Beginning balance	$ 33,847	$ 29,673
Changes in estimates related to pre-existing warranties	0	0
Settlements made during the period	(1,114)	(1,074)
Ending balance	$ 32,733	$ 28,599