Summit Materials, Inc.
Summit Materials, LLC
1550 Wynkoop Street
3rdFloor
Denver, CO 80202
Telephone: (303) 893-0012
Fax: (303) 893-6993
	February 28, 2017
U.S. Securities and Exchange Commission
100 F Street, N.E.
Washington, D.C. 20549

Re:   Notice of disclosure filed in Annual Report on Form 10-K 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. and Summit Materials, LLC have made disclosure pursuant to those provisions in their Annual Report on Form 10-K for the year ended December 31, 2016, which was filed with the Securities and Exchange Commission on February 28, 2017.

Respectfully submitted,
SUMMIT MATERIALS, INC.
SUMMIT MATERIALS, LLC
By:	/s/ Anne Lee Benedict
Name:	Anne Lee Benedict
Title:	Chief Legal Officer