Investor Presentation

Summit Materials Overview Pure-Play, Vertically-Integrated Heavy Materials Business 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 Focused on acquiring/integrating/improving assets in well-structured markets Proven management team with decades of industry experience Founded by Tom Hill (current CEO) and former CEO of OldCastle Materials Leading Positions In Early-Cycle Markets Top 4 Market By Net Revenue (2017) Market Exposure 2 Consolidating Fragmented Materials Markets 1 12 8 9 8 h..Ali 4 3 2 2014 14 2009 2010 2011 2012 2013 Number of Acquisitions 11 2015 2016 2017 2018 Cumulative Spend ($MM) $3,500 $3,000 $2,500 $2,000 $1,500 $1,000 $500 $0 SUMMIT Materials

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