RidgeSeal is a 35 mil, gray surface waterproofing membrane that is designed for hip and ridge applications using clay and concrete tile roofing materials. It eliminates costly mortar applications where blowing rain can enter. RidgeSeal is flexible for easy installation and because of its strength, composition and durable UV-resistant surface, can be left exposed for up to six months. Backed by a 5-Year warranty. RidgeSeal PowerBond is NOT available through our online store.