Investor Presentation

Consistent Margin Expansion Since IPO Adjusted EBITDA Margin of 28.3% in 2Q17 Adjusted EBITDA Margin +450 bps Since 2Q15(1,2) (Y/Y % Change) ~ 23.8% 2Q15 Adjusted EBITDA margin defined as Adjusted EBITDA divided by net revenue See reconciliation of Adjusted EBITDA to Net Income in the Appendix 27.8% 2Q16 9 28.3% 2Q17 SUMMIT Materials

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