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Summit Materials Announces Appointment of Anne M. Cooney and Susan A. Ellerbusch as Directors

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Summit Materials, Inc. (NYSE:SUM), a leading vertically integrated
construction materials company, today announced that its board of
directors has appointed Anne M. Cooney and Susan A. Ellerbusch as new
independent directors. With the appointment of Ms. Cooney and Ms.
Ellerbusch, Summit's board now comprises ten members. Additionally,
Summit announced today that Neil P. Simpkins will resign from the board
of directors, effective at the end of the Company's fiscal year.

Howard Lance, Chairman of Summit, stated, "We want to thank Neil
Simpkins for his immeasurable contributions over his years of service on
the board. We are excited Anne and Sue have agreed to join the Summit
board. Through her leadership roles with the General Electric Company,
Aladdin Industries and Siemens, Anne brings a breadth and depth of
experience in operations management, sourcing and marketing. Sue's
management of Air Liquide's U.S. business, including its Large
Industrials and Electronics divisions, has afforded her operational
expertise that will be an invaluable asset to the Company."

Tom Hill, CEO of Summit, added, "I join Howard in thanking Neil for his
advice to Summit since its founding. Neil has been an incredible
resource for the Company over the years. Additionally, we are pleased to
welcome Anne and Sue to our board of directors. Anne and Sue each bring
a tremendous amount of leadership expertise and financial acumen to our
board. I look forward to working with them both and the rest of our
board as we look to expand upon the exciting growth opportunities for
our business in 2018 and beyond."

Anne M. Cooney is an executive with decades of operational and
commercial experience. Ms. Cooney is the current President of the
Process Industries and Drives Division of Siemens Industry, Inc., based
in Alpharetta, GA, a division of Siemens AG, a multinational
conglomerate primarily engaged in industrial engineering, electronics,
energy, healthcare and infrastructure activities. In this role, Ms.
Cooney leads operational and commercial activities for a portfolio of
Siemens products and services across process automation, low and medium
voltage motors and drives. Since joining Siemens in 2001, Ms. Cooney has
also served as Chief Operating Officer for Siemens Healthcare's
Diagnostics division from 2011 to 2014 and as President, Drives
Technologies Division, Siemens Industry, Inc., from 2009 to 2011.
Additionally, Ms. Cooney was Vice President of Manufacturing at Aladdin
Industries and held key managerial positions with the General Electric
Company. Ms. Cooney also serves on the Board of Directors of The
Manitowoc Company, Inc. and is a member of its audit and compensation
committees. She previously served on the boards of the Machinery and
Allied Products Institute. Ms. Cooney has a Bachelor of Science degree
in Industrial Management from Gannon University and an MBA from Emory
University.

Susan A. Ellerbusch has a 25-year tenure in the chemicals and energy
industries and her experiences span chemicals, refining and marketing
and biofuels. Since June 2017, Ms. Ellerbusch has served as CEO of Air
Liquide USA LLC, the U.S. subsidiary of Air Liquide S.A., a world leader
in gases, technologies and services for industry and health, with a
presence in 80 countries and more than 3 million customers and patients.
As head of Air Liquide's operations in the U.S., Ms. Ellerbusch leads
the company's Large Industries and Electronics businesses. Ms.
Ellerbusch joined Air Liquide in September 2015 as President of Air
Liquide Large Industries U.S., where she led the restructuring of the
business to enable a greater focus on operational performance and
customer engagement. Prior to Air Liquide, Ms. Ellerbusch worked at
British Petroleum, or BP, where she held roles of increasing leadership
and most recently served as President, BP Biofuels North America from
2008 to 2015. Ms. Ellerbusch has a Bachelor of Science degree in
genetics from the University of Illinois Urbana-Champaign and an MBA
from the University of Illinois Chicago.

About Summit Materials

Summit Materials is a leading vertically integrated materials-based
company that supplies aggregates, cement, ready-mix concrete and asphalt
in the United States and British Columbia, Canada. Summit is a
geographically diverse, materials-based business of scale that offers
customers a single-source provider of construction materials and related
downstream products in the public infrastructure, residential and
nonresidential, and end markets. Summit has a strong track record of
successful acquisitions since its founding and continues to pursue
growth opportunities in new and existing markets.

For more information about Summit Materials, please visit www.summit-materials.com.

Cautionary Statement Regarding Forward-Looking Statements

This press release contains "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," "should," "seeks," "intends,"
"trends," "plans," "estimates," "projects" or "anticipates" or similar
expressions that concern our strategy, plans, expectations or
intentions. These forward-looking statements are subject to risks,
uncertainties and other factors that may cause our actual results,
performance or achievements to be different from future results,
performance or achievements expressed or implied by such forward-looking
statements. These forward-looking statements are subject to risks,
uncertainties and other factors that may cause our actual results,
performance or achievements to be materially different from future
results, performance or achievements expressed or implied by such
forward-looking statements. We derive many of our forward-looking
statements from our operating budgets and forecasts, which are based
upon many detailed assumptions. While we believe that our assumptions
are reasonable, it is very difficult to predict the effect of known
factors, and, of course, it is impossible to anticipate all factors that
could affect our actual results.

In light of the significant uncertainties inherent in the
forward-looking statements included herein, the inclusion of such
information should not be regarded as a representation by us or any
other person that the results or conditions described in such statements
or our objectives and plans will be realized. Important factors could
affect our results and could cause results to differ materially from
those expressed in our forward-looking statements, including but not
limited to the factors discussed in the section entitled "Risk Factors"
in our Annual Report on Form 10-K for the fiscal year ended December 31,
2017. Such factors may be updated from time to time in our periodic
filings with the Securities and Exchange Commission ("SEC"), which are
accessible on the SEC's website at www.sec.gov.
We undertake no obligation to publicly update or revise any
forward-looking statement as a result of new information, future events
or otherwise, except as required by law.

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