Summit Materials, Inc. announced that, effective January 8, 2018 (the Commencement Date), Karl H. Watson Jr. has been appointed Executive Vice President and Chief Operating Officer of the company effective January 8, 2018. Mr. Watson is currently on the board of directors of the Texas Aggregates & Concrete Association and on the executive committee of the Portland Cement Association where he served as the vice chairman from 2013 to 2015.