GAF Materials Corp

Owens Corning Corporation is the world's largest manufacturer of fiberglass and related products. It was formed in 1935 as a partnership between two major American glassworks, Corning Glass Works and Owens-Illinois.

Founded in 1913, MacArthur Company manufacturers and distributes pipe insulation, as well as pipe insulation accessories, HVAC and roofing products. Company clients include the building industry, manufacturers, OEM and the contractor. It has offices in St. Paul and Duluth, Minn., Billings and Missoula, Mont., Sioux Falls, S.D., and Fargo, N.D. The company offers products such as adhesives, painted and coated metals, building insulation, commercial and residential roofing, duct and sheet metal connections, caulking and sealants, exhaust piping, fastening systems and fire protection products. High-temperature insulation, gaskets, cloths, roof hatches, smoke vents and skylights are also offered. The MacArthur Company is headquartered in St. Paul, Minn.

Founded in 1917, Cretex Companies supplies a range of heart pacemaker components and prestressed concrete bridge beams in the central United States. It operates Concrete Products North, which is a subsidiary that features gasketed and nongasketed pipes, manholes, catch basins, and single-cell box culverts. The company also manages Concrete Products West, which specializes in the precasting of concrete drainage products in Montana, North Dakota, South Dakota and Wyoming. Its Concrete Products Midwest division offers structural installation and concrete pipe and hydraulic design services. Cretex Companies supplies products for the construction of various bridges, office buildings, hotels, stadiums and correctional facilities.