Summit Materials to Combine with Argos USA

Attractive Financial Benefits Expected Significant Synergy Opportunity Attractive Transaction Value Accretive to Financial Metrics Well Capitalized Balance Sheet ● ● ● ● ● +$100MM p.a. of operational synergies Significant synergy realization within two years ~10x 2023E EBITDA multiple; less than 8x synergized ROIC from transaction > WACC by year three 15-25% free cash flow per share accretion expected Accretive to EBITDA growth rates with double-digit growth going forward Closing net leverage ≤3x combined EBITDA (before synergies) Significant combined free cash flow to drive deleveraging SUMMIT Materials

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