Investor Presentation

Robust Incremental Margins Adjusted Cash Gross Profit Incremental Margins by LOB Seeing Sustained Strength In Cement and Aggregates Incremental Margins (1) (1) 53.1% 2Q16 59.2% 147.2% 2Q17 100.4% Cement Aggregates 47.9% 10 84.4% LTM 2Q16 Incremental Adjusted Cash Gross Profit Margin defined as LTM y/y change in Adjusted Cash Gross Profit divided by the LTM y/y change in Net Revenue 62.8% 75.9% LTM 2Q17 SUMMIT Materials

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