Summit Materials, Inc.

1550 Wynkoop Street

3^rd Floor

Denver, CO 80202

Telephone: (303) 893-0012

Fax: (303) 893-6993

August 10, 2015

U.S. Securities and Exchange Commission

100 F Street, N.E.

Washington, D.C. 20549

 

Re:

Notice of disclosure filed in Quarterly Report on Form 10-Q under Section 219 of the Iran Threat Reduction and Syria Human Rights Act of 2012 and Section 13(r) of the Exchange Act

Dear Sirs and Mesdames:

Pursuant to Section 219 of the Iran Threat Reduction and Syria Human Rights Act of 2012 and Section 13(r) of the Securities Exchange Act of 1934, as amended, notice is hereby provided that Summit Materials, Inc. has made disclosure pursuant to those provisions in its Quarterly Report on Form 10-Q for the quarter ended June 27, 2015, which was filed with the Securities and Exchange Commission on August 10, 2015.