This is the strongest building panel you can buy. Composed of virtually unbreakable polycarbonate, it is 20 times stronger than 5 oz. fiberglass, yet it is flexible and easy to work with. It is perfect for extreme temperatures (270 deg. F. to -40 deg. F.). Tuftex PolyCarb offers all-weather protection for patios, sun porches, deck covers, and many other home improvement projects, as well as light commercial and agricultural applications. 100% UV protected and hail-resistant. Corrugation: In. peak to peak, 9/16 In. high and 3/4 In. flat part. Lifetime limited warranty.