Ondura Premium Roofing Panel can be installed over open purlins, solid decking, or existing shingles or metal roofing. Does not rust or corrode like metal roofing. Does not radiate heat or cold like metal. Resists high winds. Much quieter than metal roofing. Utilizes advancements in resins and painting technology which uses an enhanced pigment/paint process throughout the panel, not just a surface coating. Environmentally preferable product, made from 50% recycled material. 3 In. overlap, covers 17.94 Sq. Ft. Comes backed with a Lifetime Limited Warranty