Overview of ACG Materials Acquisition November 2018

Forward-Looking Statements Moving Infrastructure Forward — ACG Materials Acquisition, November 2018 2 Some statements in this presentation, which are not historical facts, are “forward-looking statements” as defined by the Private Securities Litigation Reform Act of 1995. Forward-looking statements include statements about Arcosa’s estimates, expectations, beliefs, intentions or strategies for the future. Arcosa uses the words “anticipates,” “assumes,” “believes,” “estimates,” “expects,” “intends,” “forecasts,” “may,” “will,” “should,” “guidance,” “outlook,” and similar expressions to identify these forward-looking statements. Forward-looking statements speak only as of the date of this release, and Arcosa expressly disclaims any obligation or undertaking to disseminate any updates or revisions to any forward-looking statement contained herein, except as required by federal securities laws. Forward-looking statements are based on management’s current views and assumptions and involve risks and uncertainties that could cause actual results to differ materially from historical experience or our present expectations, including but not limited to assumptions, risks and uncertainties regarding achievement of the expected benefits of Arcosa’s spin-off from Trinity; tax treatment of the spin-off; inability to consummate the ACG Materials acquisition within the expected time periods or at all, failure to successfully integrate ACG Materials, or failure to achieve the expected benefits of the acquisition; market conditions and customer demand for Arcosa’s business products and services; the cyclical nature of, and seasonal or weather impact on, the industries in which Arcosa competes; competition and other competitive factors; governmental and regulatory factors; changing technologies; availability of growth opportunities; market recovery; improving margins; and Arcosa’s ability to execute its long-term strategy, and such forward-looking statements are not guarantees of future performance. For further discussion of such risks and uncertainties, see “Information Statement Summary”, “Risk Factors” and “Forward-Looking Statements” in the information statement filed as an exhibit to Arcosa’s Registration Statement on Form 10, as amended.

How to Find Us Moving Infrastructure Forward — ACG Materials Acquisition, November 2018 3 Investor ContactInvestorResources@arcosa.com NYSE tickerACA Our websitewww.arcosa.com HeadquartersArcosa, Inc.500 North Akard StreetDallas, TX 75201

ACG Materials highlights Moving Infrastructure Forward — ACG Materials Acquisition, November 2018 4 Multi-State Platform $152M LTM Revenue1 $32M LTM Adjusted EBITDA1 24Active Mines 5Production Facilities Diverse End Markets Adds complementary, scaled specialty materials and aggregates platforms Diversifies customer base across attractive end markets Accelerates growth into specialty materials and aggregates Strengthens pipeline of acquisitions and organic growth opportunities Adds expertise in developing specialty materials applications Brings top tier management team to Arcosa Aggregate mines Corporate HQ Production facilities 1 Estimated LTM for 12 months ended 08/31/2018. See Adjusted EBITDA reconciliation in Appendix

The acquisition is aligned with Arcosa’s long term vision and Stage 1 Priorities Moving Infrastructure Forward — ACG Materials Acquisition, November 2018 5 Improve long term returns on invested capital Grow in attractive markets where we can achieve sustainable competitive advantages Reduce the complexity and cyclicality of the overall business  Operate a flat and responsive corporate structure Expand Transport-ation Products organically as barge and rail markets recover Improve Energy Equipment’s operational performance while pursuing disciplined growth Grow Construction Products organically and through acquisitions    Stage 1 Priorities Long Term Vision

ACG Materials is a strategic acquisition for Arcosa’s Construction Products Group Moving Infrastructure Forward — ACG Materials Acquisition, November 2018 6 Aggregates Specialty Materials Construction Site Support

Adds complementary, scaled aggregates and specialty materials businesses to Arcosa’s current platforms Moving Infrastructure Forward — ACG Materials Acquisition, November 2018 7 Operations Products Geographic Footprint 18 active Construction Materials locations 11 aggregate mines7 lightweight locations Aggregates (sand, gravel, and limestone base)Lightweight aggregates 29 active locations24 aggregate mines5 production facilites Mined and crushed rock (aggregates, cement / retarder rock, fines)Specialty milled (building products, fertilizers)Specialty processed (plasters, agricultural prills, food/pharma) Aggregate mines Lightweight locations Aggregate mines Production facilities

Diversifies customer base across attractive end markets and accelerates growth in specialty materials Moving Infrastructure Forward — ACG Materials Acquisition, November 2018 8 Mined and Crushed Rock Specialty Milled Specialty Processed Products Applications Road constructionWell padsAccess roadsCement / retarder rockFertilizer, soil conditioner Bathtubs, caulk, paint, joint compoundsRoofing tilesGlass packagingAnimal feed additiveFertilizer, soil conditionerPlastics and coatings Flooring, ceramicsGolf turf, fertilizerMicronutrientsBaking, brewing End Markets EnergyInfrastructureBuilding productsAgriculture Building productsAgriculture Building productsAgricultureFood and pharmaceutical Aggregate Rock Retarder Rock Fines Filler Coarse Food Grade Plasters Prills Source: Company provided information; Management estimates.

Brings top tier management team and strengthens pipeline of organic projects and bolt-on acquisition opportunities Moving Infrastructure Forward — ACG Materials Acquisition, November 2018 9 Top tier management team Pipeline of organic projects and bolt-on acquisition opportunities Strong leadership team with deep industry experience in infrastructure and building productsTrack record of operating excellence and growthExpertise in developing specialty materials applications in attractive markets ACG team has completed 9 bolt-on acquisitions since 2013, within aggregates and specialty materialsCurrent pipeline of opportunities to grow organically and through additional bolt-on acquisitions

Transaction and Financing Summary Moving Infrastructure Forward — ACG Materials Acquisition, November 2018 10 Financing Purchase price of approximately $315 millionArcosa expects to fund the transaction with a combination of cash on-hand and advances under our $400 million five year, credit facility Expected Close Q4 2018 – Q1 2019Subject to customary closing conditions and regulatory provisions under the Hart-Scott-Rodino Act Accretion Expected to be accretive to earnings in year one following transaction completion Arcosa expects to revisit its revenue and EBITDA guidance for fiscal year 2019, following the closing and additional clarity on purchase price accounting

Investment Highlights Moving Infrastructure Forward — ACG Materials Acquisition, November 2018 11 Adds complementary, scaled aggregates and specialty materials platforms Diversifies customer base across attractive end markets Accelerates growth into specialty materials and aggregates Brings top tier management team to Arcosa Strengthens pipeline of acquisitions and organic growth opportunities Adds expertise in developing specialty materials applications

Appendix

Adjusted EBITDA reconciliation (unaudited) Moving Infrastructure Forward — ACG Materials Presentation, November 2018 13 $ Millions (For the Trailing Twelve Months Ended August 31, 2018) Net income (1.8) Add: Interest expense 16.6 Provision/(benefit) for income taxes (3.9) Depreciation & amortization expense 15.4 Other adjustments 5.7 Adjusted EBITDA 32.0 “Adjusted EBITDA” is defined as ACG’s net income plus interest expense, income taxes, depreciation and amortization, and other one-time or non-recurring expenses, including management fees, debt refinancing fees, and non-recurring professional fees. Adjusted EBITDA is not a calculation based on generally accepted accounting principles. The amounts included in the Adjusted EBITDA calculation, however, are derived from amounts included in the historical statements of operations data. In addition, Adjusted EBITDA should not be considered as an alternative to net income or operating income as an indicator of ACG’s operating performance, or as an alternative to operating cash flows as a measure of liquidity. We believe Adjusted EBITDA assists investors in comparing a company’s performance on a consistent basis without regard to depreciation and amortization and other expenses, which can vary significantly depending upon many factors.