For generations, low-maintenance Mastic siding from Ply Gem has been the number 1 choice among homeowners, builders, and remodelers. Solid and tough, Mastic premium siding and Ply Gem Stone stands up to extreme weather, requires little maintenance, and is an eco-friendly choice for your family. Best of all, you are covered with an industry leading limited lifetime warranty backed by Ply Gem, the 75-year leader in pioneering performance home exteriors.