Investor Presentation

Summit Materials Overview Pure-Play, Our Value Proposition Materials-based positions in well-structured, early-cycle markets Integrated supplier of construction materials (aggregates, cement), products (ready-mix concrete, asphalt) and paving services Favorable long-term industry dynamics within private and public end-markets 2/3 of net revenue = early cycle residential/non-residential end markets; 1/3 of net revenue = state public infrastructure spending Exceptional record of financial growth and operational execution Since IPO (2015), generated significant growth in net revenue, adjusted EBITDA, net income, all while reducing net leverage Unique acquisition strategy with proven integration experience Invested $2.6 billion in 57 acquisitions since 2009; focused on acquiring/integrating/improving assets in well-structured markets - - Vertically-Integrated Heavy Materials Business - Proven management team with decades of industry experience Founded by Tom Hill (current CEO) and former CEO of Old Castle Materials Leading Positions In Early-Cycle Markets 3 Top 5 Market By Net Revenue (2016) Market Exposure 21 STATES + VANCOUVER, B.C. Geographically diverse portfolio 12 PLATFORM COMPANIES Completed 57 acquisitions since 2009 TOP 5 STATES By net revenue: TX, UT, KS, MO, VA SUMMIT Materials

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