If you are looking for a roof replacement but don't have any idea which type of roofing is the best for you? We recommend you Polycarb Roofing. Check out Robot Building Supplies. We are a supplier of Polycarbonate roofing sheets. Our roofing sheets are designed with advanced polymer with optical and physical properties that are unmatched by any other material. Polycarbonate sheets have strength up to 150 times. It also has an essential surface treatment that will stop UV degradation of the sheet surface and help extend its life on your roof sheets at Robot Building Supplies.