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Welcome to the Summit Jefferson QuarrySite Tour September 2021

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Market Leadership

Forward-Looking Statements

This presentation includes “forward-looking statements” within the meaning of the federal securities laws, which involve risks and uncertainties. Forward-looking statements include all statements that do not relate solely to historical or current facts, and you can identifyforward-looking statements because they contain words such as “believes,” “expects,” “may,” “will,” “outlook,” “should,” “seeks,” “intends,” “trends,” “plans,” “estimates,” “projects” or “anticipates” or similar expressions that concern our strategy, plans, expectations orintentions. All statements made relating to our estimated and projected earnings, margins, costs, expenditures, cash flows, growth rates and financial results are forward-looking statements. These forward-looking statements are subject to risks, uncertainties and otherfactors that may cause our actual results, performance or achievements to be materially different from future results, performance or achievements expressed or implied by such forward-looking statements. We derive many of our forward-looking statements from ouroperating budgets and forecasts, which are based upon many detailed assumptions. While we believe that our assumptions are reasonable, it is very difficult to predict the effect of known factors, and, of course, it is impossible to anticipate all factors that could affect ouractual results. In light of the significant uncertainties inherent in the forward-looking statements included herein, the inclusion of such information should not be regarded as a representation by us or any other person that the results or conditions described in suchstatements or our objectives and plans will be realized. Important factors could affect our results and could cause results to differ materially from those expressed in our forward-looking statements, including but not limited to the factors discussed in the section entitled“Risk Factors” in Summit Materials, Inc.’s (“Summit Inc.”) Annual Report on Form 10-K for the fiscal year ended January 2, 2021 as filed with the Securities and Exchange Commission (the “SEC), and any factors discussed in the section entitled “Risk Factors” in any ofour subsequently filed SEC filings; and the following: the impact of the coronavirus (“COVID-19”) pandemic on our business, or any similar crisis; our dependence on the construction industry and the strength of the local economies in which we operate; the cyclical natureof our business; risks related to weather and seasonality; risks associated with our capital-intensive business; competition within our local markets; our ability to execute on our acquisition strategy, successfully integrate acquisitions with our existing operations and retainkey employees of acquired businesses; our ability to implement and successfully execute on our Elevate Summit Strategy; our dependence on securing and permitting aggregate reserves in strategically located areas; declines in public infrastructure construction anddelays or reductions in governmental funding, including the funding by transportation authorities and other state agencies particularly if such are not augmented by federal funding or if the federal government fails to act on a highway infrastructure bill; our reliance onprivate investment in infrastructure, which may be adversely affected by periods of economic stagnation and recession; environmental, health, safety and climate change laws or governmental requirements or policies concerning zoning and land use; costs associatedwith pending and future litigation; rising prices for commodities, labor and other production and delivery inputs as a result of inflation or otherwise; conditions in the credit markets; our ability to accurately estimate the overall risks, requirements or costs when we bid on ornegotiate contracts that are ultimately awarded to us; material costs and losses as a result of claims that our products do not meet regulatory requirements or contractual specifications; cancellation of a significant number of contracts or our disqualification from biddingfor new contracts; special hazards related to our operations that may cause personal injury or property damage not covered by insurance; unexpected factors affecting self-insurance claims and reserve estimates; our substantial current level of indebtedness, includingour exposure to variable interest rate risk; our dependence on senior management and other key personnel, and our ability to retain and attract qualified personnel; supply constraints or significant price fluctuations in the electricity and petroleum-based resources that weuse, including diesel and liquid asphalt; climate change and climate change legislation or other regulations; unexpected operational difficulties; interruptions in our information technology systems and infrastructure, including cybersecurity and data leakage risks; andpotential labor disputes, strikes, other forms of work stoppage or other union activities. All subsequent written and oral forward-looking statements attributable to us, or persons acting on our behalf, are expressly qualified in their entirety by these cautionary statements.Any forward-looking statement that we make herein speaks only as of the date of this presentation. We undertake no obligation to publicly update or revise any forward-looking statement as a result of new information, future events or otherwise, except as required bylaw.

Non-GAAP Financial Measures

Included in this presentation are certain non-GAAP financial measures, such as Adjusted EBITDA, Adjusted EBITDA Margin, and Return on Invested Capital (ROIC), designed to complement the financial information presented in accordance with U.S. GAAP becausemanagement believes such measures are useful to investors. These non-GAAP financial measures should be considered only as supplemental to, and not superior to, financial measures provided in accordance with GAAP. Please refer to the appendix of thispresentation for a reconciliation of the historical non-GAAP financial measures included in this presentation to the most directly comparable financial measures prepared in accordance with GAAP.

Reconciliations of the non-GAAP measures used in this presentation are included or described in the tables attached to the appendix. Because GAAP financial measures on a forward-looking basis are not accessible, and reconciling information is not available withoutunreasonable effort, we have not provided reconciliations for forward-looking non-GAAP measures. For the same reasons we are unable to address the probable significance of the unavailable information, which could be material to future results.

Cautionary Statement

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Safety Requirements

All visitors are to report to the main office to sign in

Site Specific Hazard Training will be provided to all visitors

3 points of contact must be maintained at all times when

entering or exiting vehicles or climning stairs/ladders

Seat Belts MUST be inspected and worn at all times if

provided on any equipment while in motion

Slips, Trips, and Falls are the #1 cause of most accidents at most mines. Be careful when

walking in the mine.

The Following PPE is required at all times in Required Areas: Hard hat, Safety glasses, high

visibility clothing, hearing protection where required, and

safety toed boots

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• Jefferson Quarry sold 1.0Mt Aggregates in 2019/2020; SUM was a royalty holder until this year

• SUM took over lease in May 2021, invested in new plant

• It is the closest quarry along I-85 to the South Carolina state line other than Carnesville (which has reserves owned by SUM)

• Jefferson is part of the Greenfield Program in Summit’s East Segment

• Its local commercial brand is Georgia Stone Products and its financial and operating results contribute to Summit’s East Segment

What You’ll See Today

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ANNE NOONAN, PRESIDENT AND CHIEF EXECUTIVE OFFICER; DIRECTORAnne Noonan joined Summit in 2020 after having served as President and CEO of OMNOVA Solutions Inc., a global producer of emulsion polymers, specialtychemicals, and decorative and functional surfaces, from November 2016 through January 2020. During her tenure, she transformed the company into a highperforming specialty solutions provider with 31% revenue and 22.5% EBITDA growth in high value specialty markets. Ms. Noonan joined OMNOVA in September2014 as President of its Performance Chemicals business segment. Prior to OMNOVA, Anne spent 27 years at Chemtura Corporation, a global manufacturer ofspecialty chemicals. During her tenure with Chemtura, Anne held leadership roles across a wide range of disciplines, from strategic marketing to productdevelopment and innovation, to mergers and acquisitions and general management. Anne serves on the board of CF Industries, a global leader in nitrogen fertilizermanufacturing and distribution. She earned her Bachelor of Science Honors degree in chemistry and her Master of Science in organometallic chemistry fromUniversity College Dublin, Ireland.AB BOXLEY, EXECUTIVE VICE PRESIDENTAb’s previous positions with Summit include President, East Region, and President, Boxley Materials Company, a construction materials producer of aggregate,asphalt, block and concrete. He is a member of World President’s Organization, Director, RGC Resources, Inc. (Roanoke Gas Company), Director PinnacleFinancial Partners, Inc., and Director Insteel Industries. Ab currently serves on the board of Carilion Clinic and is Chair of the Audit Committee, and Virginia WesternCommunity College Educational Foundation. He is a Past Chair, Roanoke Valley Economic Development Partnership and Roanoke Outside Foundation, former ViceChair GO VA Regional Council, and Board Member, Business Leadership Fund. He received his B.A. in Economics from Washington & Lee University and hisM.B.A. from the University of Virginia. Mr. Boxley has been active in youth sports, coaching Baseball, Basketball and Football in Roanoke City.BART BOYD, EAST REGION PRESIDENTBart is a 28-year, third generation industry professional and entrepreneur. He joined Summit Materials when his company, Georgia Stone Products was acquiredin 2017. Bart started his career with Vulcan Materials Company in 1994 after graduating from Georgia Southern University. Mr. Boyd worked in various roles withVMC leading up to his role as the Vice President and General Manager where he had P&L responsibility for the 24 operating quarry sites and 14 ready mixoperations in GA. Bart serves as the Chairman of the Board for Clydesdale Charitable Funding, a 501c3 organization. In addition to attending Georgia SouthernUniversity, he completed the Executive Development Program at Kellogg School of Management at Northwestern University in 2011.

Company Bios

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KARLI ANDERSON, EXECUTIVE VICE PRESIDENT, ESG AND INVESTOR RELATIONSKarli joined Summit Materials in 2019 after having served as Vice President at Royal Gold, Inc., a precious metals stream and royalty company from 2013 to 2018. Prior to that, Karli served in senior investor relations roles at Newmont Mining Corporation and Coeur Mining and was Chair of the Board of the Denver Gold Group for six years. Karli currently serves on the Board of Westwater Resources, where she is Chair of the Compensation Committee, and a member of the Audit Committee as well as the Environmental, Health and Safety Committee. Ms. Anderson received her MBA in finance from the Wharton School at the University of Pennsylvania and her Bachelor of Science degree from Ohio University. Karli is also an NACD governance fellow.

CHARLES DEPREIST, VICE PRESIDENT, ENTERPRISE STANDARDIZATIONCharles is a visionary leader with a unique blend of business development, operations management, accounting, finance, and military experience. He is the former CFO at Boxley Materials. Prior to Boxley, Charles founded Georgia Stone Products and later successfully divested the company to Summit Materials. He holds degrees from Mississippi State University in Public Accounting (Beta Alpha Psi) and Mercer University where he obtained an MBA with a concentration in Accounting.

Company Bios, Continued

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Market Leadership

Our Elevate Strategy is Designed to Deliver Superior Long-Term Value

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Strategic Priorities

Looked at what was strategically core to Summit

Conducted a right-owner analysis across the portfolio

Planning to divest 10-12 assets and identified 6 priority markets

Leverage the proceeds to double down in priority markets

Disciplined Portfolio Review

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Strategic Use of Proceeds

2 3 4

EBITDA Margin, ROIC, Location, Market Structure, Earnings Power

Filters

Demographics, Organic Growth Opportunity, Adjacency, Market Structure

Discipline

Northern Georgia is an example of Summit’s Market Leadership in the connective tissue between urban and rural markets and communities

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2014-2020 2021 2022 2023 2024

Estimated Capex and Illustrative Incremental Adjusted EBITDA from Greenfields

Cumulative Greenfields CapEx Estimated Incremental Capex Illustrative Incremental Adjusted EBITDA

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Aggregates GreenfieldsAn Important Component of our Organic Growth Strategy

We are expanding our presence in key markets: 5 Aggregates Greenfields completed

Utah, Texas (3 projects), Georgia 5 Aggregates Greenfields under development

Georgia (2), Missouri, Carolinas (2) Estimated future Greenfields spending: ~$25-35MM in 2021

~450 million tons of reserves

Recently acquired Aggregates property in Missouri

~$45MM Adjusted EBITDA per year, run rate by 2024

Cap E

x($M

)Adjusted EBITDA ($M)

Recently commissioned crushing plant, Georgia, October 2019

(1) Does not include deferred consideration.

Greenfields: Investing for Consistent, Organic Growth

Expanding our presence in the Carolinas in a region experiencing favorable residential and nonresidential growth trends as well as improving state DOT funding conditions

Building on our presence in Georgia with a greenfield startup(Jefferson) that occurred in July 2021; strong migration trends, state DOT funding +13%, major mobility program, job growth

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Market Leadership

Summit is Well-Positioned to Drive its StrategyKANSASOrganic growthAlt EnergyStable DOTUTAH

In-migrationLow housing inventoryStrong market position

GEORGIA

Low housing inventoryGreenfieldsDOT Major Mobility Program

TEXAS

Low housing inventoryConsolidating markets

Well funded DOT

VIRGINIA

Moderate organic growthStrong market positionStable DOT

MISSOURI

Moderate organic growthDistribution centersStable DOT

Summit has operations in 23 states and British Columbia. This map highlights our largest states in terms of revenue and/or potential for growth.

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• At Jefferson, we put a very labor efficient plant in a high growth market, giving us several benefits−Enables us to meet current and future needs of major Metro Atlanta ready mix and asphalt customers in a growth corridor

−The design is very flexible, which gives us the ability to adjust to product demand changes quickly

− Inventory turnover was a consideration in the design to optimize working capital investment

−Disciplined approach to efficient unit cost production in a clean, well-situated environment for employees and customers

• The new location gives our customers easy and fast access in/out of the site, by design

• The entire plant site is graded and developed to minimize waste and maximize usable acreage

• Site also does an excellent job in controlling water runoff and plant water discharge

• Moving the plant to new location frees up millions of tons of reserves under former plant

Operational Attributes

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• Designed to support Summit’s ROIC and EBITDA margin goals

• Capacity to grow with the I-85 market

Financial Attributes

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2018-2024 Population Change by State East Region States will grow:

• KY – 0.51%• VA - 0.83%• TN – 0.89%• GA – 1.10%• NC – 1.13%• SC – 1.26%• FL – 1.41%

Growth Drivers: Population Growth (%)• Weather Driving in Migration• Business Environment• Relatively Low Cost of Living

Sources: Woods & Poole Complete Economic and Demographic Data, Census Bureau's Building Permits Survey, ESRI Population Forecasts

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Invest in our people, reward their success, coach them through challengesStandardizing Aggregates Best Practices Across the Company

Subtotal Variable Cost Reduction• KPI/Planning Focus• Reduce Contract Labor• Reduce Equipment Rental

Improve Equipment Utilization• Equipment Sharing• Pit Crew Consolidation• Portable Plants

Mine Planning• Develop Detailed Short Term Mine Plans• Add Sand & Stone Reserves

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Elevate Summit Scorecard

<3x Leverage

>10%

>30%

ROIC

EBITDA Margin

3.2x

8.0%

22.6%

Goal2020A1

5 divestitures completed Strategic market area and asset light opportunities under consideration Smart standardization and centers of excellence being implemented Cultivating social responsibility and innovation expertise

8.5%

22.9%

LTM Progress2

1 The 2020 Actual values for ROIC and EBITDA margin on this chart are slightly lower than values shown on the March 16, 2021 Elevate Summit Strategy Presentation due to a modification in Summit’s reporting for transactions costs that resulted in a reclassification of our 2020 transactions costs.2 Reflects performance for the last 12 months ended July 3, 2021.

3.0x

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Market Leadership Horizon 2

Enhance our Business Models and Offerings

Explore creative business models to reduce downstream capital investment and maximize

aggregates pull through

Pursue long-term contracts and supply agreements to reduce volatility

Invest to enter prioritized markets

Horizon 3Realize and Sustain Consistent Growth

Scale successful business models to further reduce liability, volatility. And reinforce growth in new markets through innovative offerings and

solutions with differentiated value

Elevate within the organization and community to attractnew talent, investor interest, and new customers

Horizon 1 – WE ARE HEREBuild for Tomorrow with No Regret Moves

Manage the business for efficiency through smart standardization and

cultivate a culture of excellence

Divest dilutive businesses to boost margins and free up

capital for growth

Cultivate social responsibility and innovation expertise

EBITDA = 23 – 25% | 9% ROIC

<3x Leverage

EBITDA = 25 – 28% | 10% ROIC

<3x Leverage

EBITDA = 28 – 30% | 10% ROIC

<3x Leverage

Summit’s long-term financial goals are being pursued through a multi-horizon implementation of the strategy –we will regularly report on progress along the way…

Elevate Summit OverviewObjectives

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Market Leadership

Appendix

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EXHIBIT 4Reconciliation of Net Income to Further Adjusted EBITDA

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(1) Last twelve month (“LTM”) information corresponding to fiscal years (i.e., the periods ended January 2, 2021, December 28, 2019 and December 29, 2018 and reflects our audited historical results for such fiscal years presented in accordance with U.S. GAAP. Information presented for other LTM periods (i.e., July 3, 2021, April 3, 2021, September 26, 2020, June 27, 2020, March 28, 2020, September 28, 2019, June 29, 2019 and March 30, 2019) reflect unaudited trailing four quarter financial information calculated by starting with the results from the most recent audited fiscal year included in such LTM period and then (x) adding quarterly information for subsequent fiscal quarters and (y) subtracting quarterly information for the corresponding prior year period. For example, LTM July 3, 2021 has been calculated by starting with the data from the twelve months ended January 2, 2021 and then adding data for the six months ended July 3, 2021, followed by subtracting data for the six months ended June 27, 2020. This presentation is not in accordance with U.S. GAAP. However, we believe this information is useful to investors as we use it to evaluate our financial performance for ongoing planning purposes, including a continuous assessment of our financial performance in comparison to budgets and internal projections. We also use such LTM financial data to test compliance with covenants under our senior secured credit facilities. This presentation has limitations as an analytical tool, and you should not consider it in isolation or as a substitute for analysis of our results as reported under U.S. GAAP. Please see our Annual Reports on Form 10-K and Quarterly Reports on Form 10-Q for the relevant periods for the historical amounts used to calculate the LTM information presented.

(2) EBITDA for certain completed acquisitions, net of dispositions, is pro forma for all acquisitions completed as of the date listed. (3) Further Adjusted EBITDA is calculated using trailing four quarter financial data to test compliance with covenants under our senior secured credit facilities.(4) Adjusted EBITDA Margin defined as Adjusted EBITDA as a percentage of net revenue(5) Net Leverage defined as net debt divided by Further Adjusted EBITDA

Exhibit 1($ in millions) July 3, June 27, July 3, June 27, July 3, April 3, January 2, September 26, June 27, March 28, December 28, September 28, June 29, March 30,

2021 2020 2021 2020 2021 2021 2021 2020 2020 2020 2019 2019 2019 2019

Net income (loss) 58$ 59$ 35$ 12$ 164$ 165$ 141$ 141$ 107$ 86$ 61$ 6$ 22$ 21$ Interest expense 24 26 48 53 99 100 104 106 110 114 117 118 118 118 Income tax (benefit) expense 18 17 13 (6) 7 5 (12) (42) 23 22 17 78 53 48 Depreciation, depletion, amortization, and accretion expense 58 54 115 106 230 226 222 216 214 213 217 218 217 214 Loss on debt financings - - - - 4 4 4 4 - - 15 15 15 15 Gain on sale of business - - (15) - (15) (16) - - - - - - (12) (12) Tax receivable agreement expense - - - - (8) (8) (8) 16 16 16 16 (23) (23) (23) Non-cash compensation 5 5 10 10 29 29 29 28 20 19 20 21 22 23 Other 1 (1) - 1 2 3 2 4 (2) (1) (4) (1) (2) -

Adjusted EBITDA 164$ 160$ 206$ 176$ 512$ 508$ 482$ 473$ 488$ 469$ 459$ 432$ 410$ 404$ EBITDA for certain completed acquisitions, net of dispositions (2) (5) 6 11 15 - - - - - 1 Acquisition transaction expenses 2 3 3 2 3 2 2 2 2 3

Further Adjusted EBITDA (3) 509$ 517$ 496$ 490$ 491$ 471$ 461$ 434$ 412$ 408$

Net Revenue 619$ 575$ 1,017$ 918$ 2,234$ 2,191$ 2,135$ 2,069$ 2,090$ 2,067$ 2,031$ 1,969$ 1,929$ 1,925$

Adjusted EBITDA Margin (4) 26.5% 27.8% 20.2% 19.1% 22.9% 23.2% 22.6% 22.9% 23.4% 22.7% 22.6% 21.9% 21.3% 21.0%

Net Debt 1,530$ 1,646$ 1,574$ 1,732$ 1,717$ 1,774$ 1,667$ 1,820$ 1,938$ 1,940$

Total Net Leverage (5) 3.0x 3.2x 3.2x 3.5x 3.5x 3.8x 3.6x 4.2x 4.7x 4.8x

Three months ended Six months ended Last Twelve Months Ended (1)

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EXHIBIT 6Non-GAAP Reconciliation of Net Income (Loss) to Adj. EBITDA

19(1) Adjusted EBITDA Margin is defined as Adjusted EBITDA as a percentage of net revenue

Exhibit 2Reconciliation of Net Income (Loss) to Adjusted

EBITDA by Segment

($ in thousands)Net income (loss) $ 55,447 $ 37,035 $ 33,230 $ (67,954) $ 57,758 Interest expense (income) (2,860) (2,176) (4,035) 33,287 24,216 Income tax expense 1,198 156 — 17,054 18,408 Depreciation, depletion and amortization 25,133 21,146 10,143 1,101 57,523

EBITDA $ 78,918 $ 56,161 $ 39,338 $ (16,512) $ 157,905 Accretion 218 408 84 — 710 (Gain) loss on sale of businesses (273) 509 — — 236 Non-cash compensation — — — 4,827 4,827 Other (92) 206 — — 114

Adjusted EBITDA $ 78,771 $ 57,284 $ 39,422 $ (11,685) $ 163,792 Adjusted EBITDA Margin (1) 25.1% 26.1% 45.9% 26.5%

East Cement Corporate ConsolidatedWest

Three months ended July 3, 2021

Reconciliation of Net Income (Loss) to AdjustedEBITDA by Segment

($ in thousands)Net income (loss) $ 57,040 $ 32,206 $ 29,386 $ (59,745) $ 58,887 Interest expense (709) (433) (3,116) 29,866 25,608 Income tax expense (benefit) 1,054 (36) — 16,163 17,181 Depreciation, depletion and amortization 22,050 21,014 9,291 992 53,347

EBITDA $ 79,435 $ 52,751 $ 35,561 $ (12,724) $ 155,023 Accretion 115 380 86 — 581 Non-cash compensation — — — 4,892 4,892 Other (607) 253 — (229) (583)

Adjusted EBITDA $ 78,943 $ 53,384 $ 35,647 $ (8,061) $ 159,913 Adjusted EBITDA Margin (1) 26.4% 26.6% 47.1% 27.8%

CementEast

Three months ended June 27, 2020

Corporate ConsolidatedWest

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EXHIBIT 6Non-GAAP Reconciliation of Net Income (Loss) to Adj. EBITDA

20(1) Adjusted EBITDA Margin is defined as Adjusted EBITDA as a percentage of net revenue

Exhibit 3Reconciliation of Net Income (Loss) to Adjusted

EBITDA by Segment

($ in thousands)Net income (loss) $ 72,883 $ 44,004 $ 31,625 $ (113,999) $ 34,513 Interest expense (income) (4,892) (3,896) (8,080) 65,270 48,402 Income tax expense 1,384 90 — 11,491 12,965 Depreciation, depletion and amortization 50,057 42,620 18,211 2,205 113,093

EBITDA $ 119,432 $ 82,818 $ 41,756 $ (35,033) $ 208,973 Accretion 434 877 165 — 1,476 Gain on sale of businesses (273) (15,159) — — (15,432) Non-cash compensation — — — 10,190 10,190 Other (174) 493 — — 319

Adjusted EBITDA $ 119,419 $ 69,029 $ 41,921 $ (24,843) $ 205,526 Adjusted EBITDA Margin (1) 21.8% 20.2% 33.1% 20.2%

Six months ended July 3, 2021

West East Cement Corporate Consolidated

Reconciliation of Net Income (Loss) to AdjustedEBITDA by Segment

($ in thousands)Net income (loss) $ 57,538 $ 21,139 $ 17,108 $ (83,624) $ 12,161 Interest expense (income) (1,287) (1,002) (6,292) 62,007 53,426 Income tax expense (benefit) 587 (165) — (6,142) (5,720) Depreciation, depletion and amortization 43,734 41,734 17,099 1,981 104,548

EBITDA $ 100,572 $ 61,706 $ 27,915 $ (25,778) $ 164,415 Accretion 231 756 171 — 1,158 Non-cash compensation — — — 9,797 9,797 Other 608 495 — (899) 204

Adjusted EBITDA $ 101,411 $ 62,957 $ 28,086 $ (16,880) $ 175,574 Adjusted EBITDA Margin (1) 21.0% 19.6% 24.7% 19.1%

Six months ended June 27, 2020

West East Cement Corporate Consolidated

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EXHIBIT 9Non-GAAP Reconciliation of Adj. Cash Gross Profit by LOB

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(1) Net revenue for the cement line of business excludes revenue associated with hazardous and non-hazardous waste, which is processed into fuel and used in the cement plants and is included in services net revenue. Additionally, net revenue from cement swaps and other cement-related products are included in products net revenue.

(2) Adjusted cash gross profit calculated as net revenue by line of business less net cost of revenue by line of business. Adjusted cash gross profit margin is defined as adjusted cash gross profit divided by net revenue.(3) The cement adjusted cash gross profit includes the earnings from the waste processing operations, cement swaps and other products. Cement line of business adjusted cash gross profit margin defined as cement adjusted

cash gross profit divided by cement segment net revenue.

Exhibit 4 ($ in thousands)Segment Net Revenue:

West $ 313,617 $ 299,024 $ 548,361 $ 483,516 East 219,091 200,554 342,159 320,543 Cement 85,822 75,662 126,491 113,587

Net Revenue $ 618,530 $ 575,240 $ 1,017,011 $ 917,646

Line of Business - Net Revenue:Materials

Aggregates $ 153,496 $ 129,989 $ 270,884 $ 226,150 Cement (1) 82,169 73,293 120,308 106,156

Products 292,135 284,978 490,842 461,261 Total Materials and Products 527,800 488,260 882,034 793,567

Services 90,730 86,980 134,977 124,079 Net Revenue $ 618,530 $ 575,240 $ 1,017,011 $ 917,646

Line of Business - Net Cost of Revenue:Materials

Aggregates $ 67,734 $ 54,942 $ 136,031 $ 114,465 Cement 41,672 34,894 79,032 71,549

Products 237,343 226,168 408,963 382,385 Total Materials and Products 346,749 316,004 624,026 568,399

Services 71,580 67,735 111,634 107,919 Net Cost of Revenue $ 418,329 $ 383,739 $ 735,660 $ 676,318

Line of Business - Adjusted Cash Gross Profit (2):Materials

Aggregates $ 85,762 $ 75,047 $ 134,853 $ 111,685 Cement (3) 40,497 38,399 41,276 34,607

Products 54,792 58,810 81,879 78,876 Services 19,150 19,245 23,343 16,160

Adjusted Cash Gross Profit $ 200,201 $ 191,501 $ 281,351 $ 241,328

Adjusted Cash Gross Profit Margin (2)Materials

Aggregates 55.9% 57.7% 49.8% 49.4%Cement (3) 47.2% 50.8% 32.6% 30.5%

Products 18.8% 20.6% 16.7% 17.1%Services 21.1% 22.1% 17.3% 13.0%

Total Adjusted Cash Gross Profit Margin 32.4% 33.3% 27.7% 26.3%

Three months endedJuly 3, June 27,2021 2020

June 27,Six months ended

2021 2020July 3,

2222

EXHIBIT 11Capital StructureExhibit 5($ in Millions) Q2 '20 Q3 '20 Q4 '20 Q1 '21 Q2 '21 Int. Rates MaturityCash $253.4 $288.8 $418.2 $359.7 $469.1 0.04% n/aDebt:Revolver1 -- -- -- -- -- 3.39% Feb-2024Senior Secured Term Loan $621.1 $619.5 $616.3 $614.7 $613.1 2.10% Nov-2024Capital Leases and Other $57.4 $59.8 $56.3 $47.0 $40.4 5.50% VariousSenior Secured Debt $678.5 $679.3 $672.6 $661.7 $653.6 2.31%

Acq.-related Liab. $42.3 $42.5 $20.1 $44.4 $46.3 10.00% Various5.125% Senior Notes $300.0 $300.0 $300.0 $300.0 $300.0 5.125% Jun-20255.25% Senior Notes -- $700.0 $700.0 $700.0 $700.0 5.25% Jan-20296.5% Senior Notes $300.0 $300.0 $300.0 $300.0 $300.0 6.50% Mar-20276.125% Senior Notes $650.0 -- -- -- -- 6.125% n/aSenior Unsecured Debt $1,292.3 $1,342.5 $1,320.1 $1,344.4 $1,346.3 5.66%

Total Debt $1,970.8 $2,021.7 $1,992.7 $2,006.1 $1,999.9 4.57%

Net Senior Secured Debt $425.1 $390.5 $254.5 $302.0 $184.5Net Total Debt $1,717.4 $1,733.0 $1,574.5 $1,646.4 $1,530.8

Est. Annual Cash Int. Run Rate $97.3 $94.1 $91.7 $93.3 $93.1LTM Further Adj. EBITDA $491.1 $490.2 $496.5 $517.5 $509.4

Net Senior Secured Leverage 0.9x 0.8x 0.5x 0.6x 0.4xTotal Net Leverage 3.5x 3.5x 3.2x 3.2x 3.0x1 Revolver Capacity post-usage for (undrawn) Letters of Credit is $329.1M as of 7/3/21

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Salt Lake City, UT

Strategic PrioritiesMarket Leadership

15 quarter average reflects reported average of balance sheet items for the 5 quarters ended December 28, 2019; January 2, 2021;and July 3, 2021.

Exhibit 6Return on Invested Capital Calculation($ in thousands)

Q4 2019 Q4 2020 Q2 2021Total Liabilities & Shareholders Equity 3,956,706 4,154,245 4,303,008 Less: Cash (150,982) (294,156) (357,837) Less: TRA Long-Term Liability (313,241) (326,503) (326,448) Less: Trade AP (121,905) (129,465) (142,229) Less: Billings in Excess of Costs (11,914) (14,233) (13,947) Less: Accrued Expenses (109,794) (133,020) (144,625)

Total Investment 3,248,869 3,256,867 3,317,923

FY 2019 FY 2020 LTM Q2 2021Adjusted EBITDA 459,240 482,289 512,241Less: Depreciation, depletion and amortization (DD&A) (214,886) (218,682) (227,227)Less: Accretion (2,216) (2,638) (2,956)

Adj. EBITDA, less DD&A and accretion 242,138 260,969 282,058 Divided by: Investment 3,248,869 3,256,867 3,317,923 ROIC 7.5% 8.0% 8.5%

5-Quarter Average1