Exhibit 3.7

CERTIFICATE OF INCORPORATION

OF

EAST RANGE COMPANY

* * * * *

FIRST. The name of the corporation is

EAST RANGE COMPANY

SECOND. Its principal office in the State of Delaware is located at No. 100 West Tenth Street, in the City of Wilmington, County of New Castle. The name and address of its resident agent is The Corporation Trust Company, No. 100 West Tenth Street, Wilmington 99, Delaware.

THIRD. The nature of the business, or objects or purposes to be transacted, promoted or carried on are:

To mine, produce, purchase, acquire, own, prepare for market, sell and otherwise dispose of minerals, metals, ores and any other useful or valuable substances, deposits or products.

To search, prospect and explore for minerals, metals, ores, coal, stone, petroleum, gas, timber and any other useful or valuable elements, substances or products; to acquire, own, develop and exploit rights, claims and interests in lands and the products thereof; to acquire, own, maintain, develop, improve, manage, work and operate mines, pits, quarries, collieries, timberlands and properties of all kinds, and any articles, materials, machinery, equipment and property used therefor or in connection therewith.

To manufacture, separate, reduce, smelt, refine, concentrate, treat, convert, work and produce metals of all kinds; to manufacture, produce, acquire, own, prepare for market, sell, dispose of and deal in metals, alloys, metal products, ores, minerals, stone, coal, wood, petroleum, gases and the products or by-products thereof; and to establish, build, acquire,

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own, equip, maintain, improve, repair and operate mills, factories, furnaces, converters, smelters, shops, laboratories, offices, buildings, structures and works of all kinds suitable, necessary or convenient to any of the purposes of the corporation.

To manufacture, purchase or otherwise acquire, invest in, own, mortgage, pledge, sell, assign and transfer or otherwise dispose of, trade, deal in and deal with goods, wares and merchandise and personal property of every class and description.

To acquire, and pay for in cash, stock or bonds of this corporation or otherwise, the good will, rights, assets and property, and to undertake or assume the whole or any part of the obligations or liabilities of any person, firm, association or corporation.

To acquire, hold, use, sell, assign, lease, grant licenses in respect of, mortgage or otherwise dispose of letters patent of the United States or any foreign country, patent rights, licenses and privileges, inventions, improvements and processes, copyrights, trade-marks and trade names, relating to or useful in connection with any business of this corporation.

To acquire by purchase, subscription or otherwise, and to receive, hold, own, guarantee, sell, assign, exchange, transfer, mortgage, pledge or otherwise dispose of or deal in and with any of the shares of the capital stock, or any voting trust certificates in respect of the shares of capital stock, scrip, warrants, rights, bonds, debentures, notes, trust receipts, and other securities, obligations, choses in action and evidences of indebtedness or interest issued or created by any corporations, joint stock companies, syndicates, associations, firms, trusts or persons, public or private, or by the government of the United States of America, or by any foreign government, or by any state, territory, province, municipality or other political sub-division or by any governmental agency, and as owner thereof to possess and exercise all the rights, powers and privileges of ownership, including the

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right to execute consents and vote thereon, and to do any and all acts and things necessary or advisable for the preservation, protection, improvement and enhancement in value thereof.

To enter into, make and perform contracts of every kind and description with any person, firm, association, corporation, municipality, county, state, body politic or government or colony or dependency thereof.

To borrow or raise moneys for any of the purposes of the corporation and, from time to time without limit as to amount, to draw, make, accept, endorse, execute and issue promissory notes, drafts, bills of exchange, warrants, bonds, debentures and other negotiable or non-negotiable instruments and evidences of indebtedness, and to secure the payment of any thereof and of the interest thereon by mortgage upon or pledge, conveyance or assignment in trust of the whole or any part of the property of the corporation, whether at the time owned or thereafter acquired, and to sell, pledge or otherwise dispose of such bonds or other obligations of the corporation for its corporate purposes.

To loan to any person, firm or corporation any of its surplus funds, either with or without security.

To purchase, hold, sell and transfer the shares of its own capital stock; provided it shall not use its funds or property for the purchase of its own shares of capital stock when such use would cause any impairment of its capital except as otherwise permitted by law, and provided further that shares of its own capital stock belonging to it shall not be voted upon directly or indirectly.

To have one or more offices, to carry on all or any of its operations and business and without restriction or limit as to amount to purchase or otherwise acquire, hold, own, mortgage, sell, convey or otherwise dispose of, real and personal property of every class and description in any of the states, districts, territories or colonies of the United States, and in any and all foreign countries, subject to the laws of such state, district, territory, colony or country.

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In general, to carry on any other business in connection with the foregoing, and to have and exercise all the powers conferred by the laws of Delaware upon corporations formed under the General Corporation Law of the State of Delaware, and to do any or all of the things hereinbefore set forth to the same extent as natural persons might or could do.

The objects and purposes specified in the foregoing clauses shall, except where otherwise expressed, be in nowise limited or restricted by reference to, or inference from, the terms of any other clause in this certificate of incorporation, but the objects and purposes specified in each of the foregoing clauses of this article shall be regarded as independent objects and purposes.

FOURTH. The total number of shares of stock which the corporation shall have authority to issue is one thousand (1,000) shares of the par value of One Hundred Dollars ($100.00) per share, amounting in the aggregate to One Hundred Thousand Dollars ($100,000.00).

FIFTH. The minimum amount of capital with which the corporation will commence business is One Thousand Dollars ($1,000.00).

SIXTH. The names and places of residence of the incorporators are as follows:

NAMES	RESIDENCES
A. D. Atwell	Wilmington, Delaware
F. J. Obara, Jr.	Wilmington, Delaware
A. D. Grier	Wilmington, Delaware

SEVENTH. The corporation is to have perpetual existence.

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EIGHTH. The private property of the stockholders shall not be subject to the payment of corporate debts to any extent whatever.

NINTH. In furtherance and not in limitation of the powers conferred by statute, the board of directors is expressly authorized:

To make, alter or repeal the by-laws of the corporation.

To authorize and cause to be executed mortgages and liens upon the real and personal property of the corporation.

To set apart out of any of the funds of the corporation available for dividends a reserve or reserves for any proper purpose and to abolish any such reserve in the manner in which it was created.

By resolution passed by a majority of the whole board, to designate one or more committees, each committee to consist of two or more of the directors of the corporation, which, to the extent provided in the resolution or in the by-laws of the corporation, shall have and may exercise the powers of the board of directors in the management of the business and affairs of the corporation, and may authorize the seal of the corporation to be affixed to all papers which may require it. Such committee or committees shall have such name or names as may be stated in the by-laws of the corporation or as may be determined from time to time by resolution adopted by the board of directors.

When and as authorized by the affirmative vote of the holders of a majority of the stock issued and outstanding having voting power given at a stockholders’ meeting duly called for that purpose, or when authorized by the written consent of the holders of a majority of the voting stock issued and outstanding, to sell, lease or exchange all of the property and assets of the corporation, including its good will and its corporate franchises, upon such terms and conditions and for such consideration, which may be in whole or in part shares of stock in, and/or other securities of, any other corporation or corporations, as its board of directors shall deem expedient and for the best interests of the corporation.

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TENTH. Meetings of stockholders may be held outside the State of Delaware, if the by-laws so provide. The books of the corporation may be kept (subject to any provision contained in the statutes) outside the State of Delaware at such place or places as may be designated from time to time by the board of directors or in the by-laws of the corporation. Elections of directors need not be by ballot unless the by-laws of the corporation shall so provide.

ELEVENTH. The corporation reserves the right to amend, alter, change or repeal any provision contained in this certificate of incorporation, in the manner now or hereafter prescribed by statute, and all rights conferred upon stockholders herein are granted subject to this reservation.

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WE, THE UNDERSIGNED, being each of the incorporators hereinbefore named, for the purpose of forming a corporation pursuant to the General Corporation Law of the State of Delaware, do make this certificate, hereby declaring and certifying that the facts herein stated are true, and accordingly have hereunto set our hands and seals this 20th day of May A.D. 1965.

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CERTIFICATE OF AMENDMENT

OF

EAST RANGE COMPANY

CERTIFICATE OF AMENDMENT

OF

CERTIFICATE OF INCORPORATION

East Range Company, a corporation organized and existing under and by virtue of the General Corporation Law of the State of Delaware, DOES HEREBY CERTIFY:

FIRST: That at a meeting of the Board of Directors of East Range Company a resolution was adopted setting forth a proposed amendment to the Certificate of Incorporation of said corporation, declaring said amendment to be advisable and directing that a consent of the stockholders of said corporation be prepared for consideration by the stockholders. The resolution setting forth the proposed amendment is as follows:

RESOLVED, that the Certificate of Incorporation of this corporation be amended by changing the Article thereof numbered “FIRST” so that, as amended, said Article shall be and read as follows:

“The name of the corporation is NORANDEX INC.”

SECOND: That thereafter, said amendment was approved by the written consent of the sole stockholder in accordance with Section 228 of the General Corporation Law of the State of Delaware.

THIRD: That said amendment was duly adopted in accordance with the provisions of Section 242 of the General Corporation Law of the State of Delaware.

IN WITNESS WHEREOF, said East Range Company has caused its corporate seal to be affixed and this certificate to be signed by Edwin Deane Leonard, one of its Vice-Presidents, and attested by Jeffrey Small, one of its Assistant Secretaries, this seventh day of August, 1968.

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CERTIFICATE OF AMENDMENT

OF

CERTIFICATE OF INCORPORATION

NORANDEX INC. (the “Corporation”), a corporation duly organized and existing under and by virtue of the General Corporation Law of the State of Delaware, DOES HEREBY CERTIFY:

FIRST, That in an action without a meeting signed by all of the members of the Board of Directors of the Corporation pursuant to Section 141(f) of the General Corporation Law of the State of Delaware resolutions were duly adopted setting forth proposed amendments to the Certificate of Incorporation of the Corporation and declaring said amendments to be advisable. The resolutions setting forth the proposed amendments are as follows:

RESOLVED: That ARTICLE FOURTH of the Certificate of Incorporation of the Corporation be amended in its entirety to read in its entirety as set forth in Exhibit A attached hereto and made a part hereof.

EXHIBIT A

FOURTH. The total number of shares of capital stock that the corporation shall have authority to issue is 110,000, all of which shall be shares of Common Stock with a par value of $.10 per share (the “New Common Stock”).

Each share of Common Stock with a par value of $100 per share of the corporation issued and outstanding or held by the corporation as treasury stock immediately prior to the filing with the Secretary of State of Delaware of the Certificate of Amendment of the Certificate of Incorporation of the corporation whereby Article Fourth of the Certificate of Incorporation is amended as herein set forth, shall, upon such filing, thereby and thereupon be automatically reclassified and changed into 100 shares of the New Common Stock. No change to the capital of the corporation shall be effected by reason of the foregoing reclassification and charge. In the event that any fractional shares result from the foregoing reclassification and change, the corporation shall issue certificates for or including such fractional shares.

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RESOLVED: That the Certificate of Incorporation of the Corporation be amended to insert a new ARTICLE TWELFTH to read in its entirety as set forth in Exhibit B attached hereto and made a part hereof.

EXHIBIT B

TWELFTH. No Director shall be personally liable to the corporation or any stockholder for monetary damages for breach of fiduciary duty as a director, except for liability (i) for any breach of the director’s duty of loyalty to the corporation or its stockholders, (ii) for acts or omissions not in good faith or which involve intentional misconduct or a knowing violation of the law, (iii) under Section 174 of the Delaware General Corporation Law, or (iv) for any transaction from which the director derived an improper personal benefit.

Each person who was or is made a party or is threatened to be made a party to or is involved in any action, suit or proceeding, whether civil, criminal, administrative or investigative (hereinafter a “proceeding”), by reason of the fact that he or she, or a person of whom he or she is the legal representative, is or was a director or officer of the corporation or is or was serving at the request of the corporation as a director, officer, employee or agent of another corporation or of a partnership, joint venture, trust of other enterprise, including service with respect to employee benefit plans, whether the basis of such proceeding is alleged action in an official capacity as a director, officer, employee or agent or in any other capacity while serving as a director, officer, employee or agent, shall be indemnified and held harmless by the corporation to the fullest extent authorized by the Delaware General Corporation Law, as the same exists or may hereafter be amended (but, in the case of any such amendment, only to the extent that such amendment permits the corporation to provide broader indemnification rights than said law permitted the corporation to provide prior to such amendment), against all expense, liability and loss (including

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attorney’s fees, judgments, fines, ERISA excise taxes or penalties and amounts paid or to be paid in settlement) reasonably incurred or suffered by such person in connection therewith, and such indemnification shall continue as to a person who has ceased to be a director, officer, employee or agent and shall inure to the benefit of his or her heirs, executors and administrators; provided, however, that except as provided hereinafter, the corporation shall indemnify any such person seeking indemnification in connection with a proceeding (or part thereof) initiated by such person only if such proceeding (or part thereof) was authorized by the Board of Directors of the corporation. The right to indemnification conferred herein shall be a contract right and shall include the right to be paid by the corporation for the expenses incurred in defending any such proceeding in advance of its final disposition; provided, however, that if the Delaware General Corporation Law requires, the payment of such expenses incurred by a director or officer in his or her capacity as a director or officer (and not in any other capacity in which service was or is rendered by such person while a director or officer, including, without limitation, service to an employee benefit plan) in advance of the final disposition of a proceeding, shall be made only upon delivery to the corporation of an undertaking, by or on behalf of such director or officer, to repay all amounts so advanced if it shall ultimately be determined that such director or officer is not entitled to be indemnified hereunder or otherwise. The corporation may, by action of its Board of Directors, provide indemnification to employees and agents of the corporation with the same scope and effect as the foregoing indemnification of directors and officers.

If a claim under this Article Twelfth is not paid in full by the corporation within thirty (30) days after a written claim has been received by the corporation, the claimant may at any time thereafter bring suit against the corporation to recover the unpaid amount of the claim and if successful in whole

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or in part, the claimant shall be entitled to be paid also the expense of prosecuting such claim. It shall be a defense to any such action (other than an action brought to enforce a claim for expenses incurred in defending any proceeding in advance of its final disposition where the required undertaking, if any is required, has been tendered to the corporation) that the claimant has not met the standards of conduct which make it permissible under the Delaware General Corporation Law for the corporation to indemnify the claimant for the amount claimed, but the burden of proving such defense shall be on the corporation. Neither the failure of the corporation (including its Board of Directors, independent legal counsel, or its stockholders) to have made a determination prior to the commencement of such action that indemnification of the claimant is proper in the circumstances because he or she has met the applicable standard of conduct set forth in the Delaware General Corporation Law, nor an actual determination by the corporation (including its Board of Directors, independent legal counsel, or its stockholders) that the claimant has not met such applicable standard of conduct, shall be a defense to the action or create a presumption that the claimant has not met the applicable standard of conduct.

The right to indemnification and the payment of expenses incurred in defending a proceeding in advance of its final disposition conferred in this Article Twelfth shall not be exclusive of any other right which any person may have or hereafter acquire under any statute, provision of the Certificate of Incorporation, by-law, agreement, vote of stockholders or disinterested directors or otherwise.

The corporation may maintain insurance, at its expense, to protect itself and any director, officer, employee or agent of the corporation or another corporation, partnership, joint venture, trust or other enterprise against any such expense, liability or loss, whether or not the corporation would have the power to indemnify such person against such expense, liability or loss under the Delaware General Corporation law.

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SECOND: That thereafter, said amendments were approved by the written consent of the sole shareholder in accordance with Section 228 of the General Corporation Law of the State of Delaware, and said written consent was filed with the Corporation.

THIRD: That said amendments were duly adopted in accordance with the provisions of Sections 242 and 228 of the General Corporation Law of the State of Delaware.

IN WITNESS WHEREOF, said NORANDEX INC., has caused this Certificate to be signed by ROBERT W. JOHNSTON, its President, and attested by BARRY G. VIROSTEK, its Assistant Secretary, this 20th day of July, 1988.

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