CertainTeed Corp. has completed the acquisition of the roofing and fiberglass mat assets of Celotex Corp.

Cephren Inc., Palo Alto, Calif., an online workplace for the global construction industry, announced an industry partnership with the American Subcontractors Association.

Metal Sales Manufacturing Corp., Sellersburg, Ind., announced its acquisition of Custom Panel Industries, Fontana, Calif., from the parent company, Alta Industries.

SFS Stadler Inc. and Trufast Corp. jointly have entered into a marketing agreement.