Huttig Building Products, Inc. and its subsidiaries distribute millwork, building materials, and wood products used in new residential construction, home improvement, remodeling, and repair work in the United States. It offers various millwork products comprising exterior and interior doors, pre-hung door units, windows, patio doors, mouldings, frames, stair parts, and columns under Therma-Tru, Masonite, HB&G, Huttig Windows, Woodgrain, Windsor, and L. J. Smith brand names; and general building products, such as roofing, siding, insulation, flashing, housewrap, connectors and fasteners, decking, drywall, kitchen cabinets, and other miscellaneous building products under Typar, Timbertech, Fiberon, Simpson Strong-Tie, Huttigrip Fasteners, Louisiana Pacific, Owens Corning, and CertainTeed brand names. The company provides various wood products, which include engineered wood products, such as floor systems, as well as lumber and wood panels. The company sells its products to building materials dealers; national buying groups; home centers; and industrial users, including makers of manufactured homes. As of December 31, 2009, Huttig Building Products distributed its products through 27 distribution centers serving 41 states. Huttig Building Products, Inc. was founded in 1913 and is headquartered in St. Louis, Missouri.