Exhibit 32.1

Certification

Pursuant to 18 U.S.C. Section 1350

As adopted pursuant to

Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the Annual Report of Summit Materials, Inc. (the “Company”) on Form 10-K for the fiscal year ended December 30, 2017 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Thomas W. Hill, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(i)The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(ii)The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

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Date: February 14, 2018

/s/ Thomas W. Hill

Thomas W. Hill

Chief Executive Officer

(Principal Executive Officer)