Variform is one of the largest manufacturing companies that provides a range of vinyl siding in North America. It offers various locking systems for residential, light commercial and commercial applications. The company also provides soffit systems, trim coils, columns and other accessories. Variform offers installation services for products. In addition, it serves homebuilders, distributors, investors and families. Founded in 1964, the company provides items under the Timber Oak series. Variform has a staff of more than 1,000 employees. It maintains an online marketing library. The company s products are certified by Vinyl Siding Institute. Variform is a part of the Ply Gem Siding Group.