Variform by PlyGem, a Division of Cornerstone Building Brands is a trusted brand by professionals and homeowners since 1964. Earning it one of the industry’s highest satisfaction ratings. Boasting a wide array of styles and one of the broadest color palettes in vinyl siding. Variform is virtually maintenance-free and never needs painting. Plus, Ply Gem Residential Solutions has endorsed Variform, a division of Cornerstone Building Brands, the nation’s leading exterior building products company. Variform branded products provide peace of mind with an impressive limited lifetime transferable warranty