Investor Presentation

Adjusted Cash Gross Margin Scorecard LTM 2Q17 Margins Increased Across all Lines of Business Aggregates Business Adjusted Cash Gross Profit Margin (%)(1,2) 63.3% IN 2Q16 26.9% 68.3% 2Q16 2Q17 Products Business Adjusted Cash Gross Profit Margin (%)(1,2) 25.6% 60.5% 2Q17 LTM 2Q16 LTM 2Q17 62.9% 25.6% 25.8% LTM 2Q16 LTM 2Q17 Cement Segment Adjusted Cash Gross Profit Margin (%)(1,2) 57.4% 8 52.2% 2Q16 26.5% 2Q17 2Q16 Services Business Adjusted Cash Gross Profit Margin (%)(1,2) 27.7% 2Q17 43.7% LTM 2Q16 LTM 2Q17 See reconciliations of Adjusted Cash Gross Profit Margin in the appendix Adjusted Cash Gross Profit Margin is defined as Adjusted Cash Gross Profit divided by Net Revenue. In this presentation of the data, Adjusted Cash Gross Profit is calculated by line of business, less net cost of revenue by line of business 46.0% 26.3% 29.5% LTM 2Q16 LTM 2Q17 SUMMIT Materials

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