EXECUTION COPY

JOINDER AGREEMENT
 
This Joinder Agreement (this “Joinder Agreement”) to the Redemption Agreement
dated August 5, 2010 (the “Redemption Agreement”) by and among Kurtz Gravel
Company, a Michigan corporation, Superior Holdings, Inc. (f/k/a Superior
Redi-Mix, Inc.), a Michigan corporation, BWB, Inc. of Michigan, a Delaware
corporation, Builders’ Redi-Mix, LLC, a Delaware limited liability company, and
USC Michigan, Inc., a Delaware corporation (hereinafter sometimes collectively
referred to as the “Joint Venture Partners”), U.S. Concrete, Inc., a Delaware
corporation (“USC”), Superior Materials Holding, LLC, a Michigan limited
liability company (“Superior”), and Edw. C. Levy Co., a Michigan corporation
(“Levy”) is entered into this 30th day of September, 2010.
 
Pursuant to Section 16 of the Agreement, USC, the Joint Venture Parties, Levy
and VCNA Prairie, Inc. (the “New Joint Venture Partner”) hereby agree as
follows:
 
New Joint Venture Partner hereby agrees that upon execution of this Joinder
Agreement, it hereby is joined to and becomes a party to the Redemption
Agreement and is subject to the obligations set forth in Section 2.a thereof as
an Indemnifying Party as if it were an original party thereto. For purposes of
Section 2.a, after giving effect to the Redemption, the percentage interest in
Superior of New Joint Venture Partner shall be 50% and the percentage interest
in Superior of Levy shall be 50%.
 
In addition, Votorantim Cement North America, Inc. (“VCNA”) hereby agrees that
upon the execution of this Joinder Agreement, VCNA hereby is joined to, and
becomes a party to, the Redemption Agreement and is subject to the obligations
of the New Joint Venture Partner set forth in Section 2.a. thereof as an
Indemnified Party as if it were an original party thereto.
 
This Joinder Agreement shall be construed and enforced in accordance with the
laws of the State of Michigan. The state courts in Oakland County, Michigan and
the Federal Court in Wayne County, Michigan shall be the sole and exclusive
forums for the resolution of any disputes arising from this Agreement, and the
parties to this Agreement hereby submit to the personal jurisdiction and process
of these courts.

All notices pursuant to the Redemption Agreement shall be sent to Levy at the
address sort forth on its signature page hereto.

[Signature Page Follows]

 

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Kurtz Gravel Company,
 
a Michigan corporation
       
By:
/s/ Michael W. Harlan
       
Its:
Vice President
       
Dated:
9/30/2010
       
Superior Holdings, Inc.,
 
f/k/a Superior Redi-Mix, Inc.,
 
a Michigan corporation
       
By:
/s/ Michael W. Harlan
       
Its:
Vice President
       
Dated:
9/30/2010
       
BWB, Inc. of Michigan,
 
a Delaware corporation
       
By:
/s/ Curt M. Lindeman
       
Its:
Vice President
       
Dated:
9/30/2010
       
Builders’ Redi-Mix, LLC,
 
a Delaware limited liability company
       
By:
/s/ Curt M. Lindeman
       
Its:
Vice President
       
Dated:
9/30/2010
       
U.S. Concrete, Inc.
 
a Delaware corporation
       
By:
/s/ Curt M. Lindeman
       
Its:
Vice President
       
Dated:
9/30/2010
 

[Signature Page to Joinder Agreement (Redemption Agreement)]

 

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USC Michigan, Inc.,
 
a Delaware corporation
       
By:
/s/ Michael W. Harlan
       
Its:
Vice President
       
Dated:
9/30/2010
       
Superior Materials Holdings, LLC,
 
a Michigan limited liability company
       
By:
/s/ Jeffrey Spahr
       
Its:
President
       
Dated:
9/30/2010
       
Edw. C. Levy Co.,
 
a Michigan corporation
       
8800 Dix Avenue
 
Detroit, Michigan 48209
       
By:
/s/ EvanWeiner
       
Its:
/s/ COO
       
Dated:
9/30/2010
       
VCNA Prairie, Inc.,
 
a Delaware corporation
       
By:
/s/ David Plummer
       
Its:
/s/ President
       
Dated:
9/30/2010
 

[Signature Page to Joinder Agreement (Redemption Agreement)]

 

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Votorantim Cement North America, Inc.,
 
an Ontario corporation
       
By:
/s/ Erik Madsen
       
Its:
/s/ President and CEO
       
Dated:
9/30/2010
 

[Signature Page to Joinder Agreement (Redemption Agreement)]

 

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