Our Smart Rib® panel is painted with a siliconized polyester paint system that carries a 40-year limited paint warranty. Below the paint is an 80,000 minimum psi, ASTM A 792 galvalume coated steel which carries a 20-Year limited warranty. Smart RibŪ also carries a ULŪ 2218/Class4 impact rating, which means Smart RibŪ can stand up to harsh weather conditions. Our ULŪ certification number is R21507. Smart RibŪ is available in 20 colors of 29 gauge and 16 Colors of 26 Gauge. Smart RibŪ is also available in bare galvanized and galvalume, both are coated with a tough acrylic coating that makes installation easier and safer. The flat area on top of the major ribs makes it easier for those who prefer using nails.