Although terms of the deal were not disclosed, the company is one of the largest wholesale distributor of roofing supplies and related materials in the US, operating almost 60 stores across 24 states.
CDR targets companies which have enterprise values of between $1bn and $15bn according to its website.
Philip Knisely, an operating advisor at CDR, has been appointed RSG chairman following the deal.
Houston-based mid-market firm Sterling wrapped up fundraising for its third buyout fund on $820m in 2010, easily beating its $600m target.
Investors included Allianz Capital Partners, the Canada Pension Plan Investment Board, Constitution Capital Partners, the Credit Suisse Customized Fund Investment Group and the State of Wisconsin Investment Board.
The firm focuses on investments in companies with enterprise values between $100m and $500m, and has bought out 41 platform companies and numerous bolt-ons since it was formed in 1982.
It currently has $1.2bn of committed capital under management across three funds.
The bigger Clayton, Dubilier & Rice has about $17bn of assets under management across 51 US and European businesses, generally in distribution and building products companies.
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