3Q20 Results Investor Presentation October 28, 2020 SUMMIT Materials Legal Disclaimer Forward-Looking Statements This presentation includes "forward-looking statements" within the meaning of the federal securities laws, which involve risks and uncertainties. Forward-looking statements include all statements that do not relate solely to historical or current facts, and you can identify forward-looking statements because they contain words such as "believes," "expects," "may," "will," "outlook," "should," "se ...