... and sound insulationl Underlying Layer: It's a good materials toughness special to ensure the strength at the sam time ... with heavy acid rain as well as the durability of roofing.Specifications:Thickness -- 2.0mm, 2.5mm, 3.0mmColor -- Blue, ... warehouses, farm market, market access, sheds and other high-end roofing materials. Especially in corrosive chemical plants, smelters, ceramic plants, soy sauce ...