As a commercial property owner you may have to find the best roof option at some point during the lifespan of your building. Commercial roofing designs for flat and low sloping roofs usually come in 5 different classifications. These five classifications are: metal roofing, built up roofing, modified bitumen roofing, Spray Polyurethane Foam (SPF roofing) and Ethylene Propylene Diene Terpolymer (EPDM). When you find the right roofing contractor you can then discuss the options you have for your commercial property. When talking with your contractor about your options there are three essential aspects that you want to think about when it comes to a low sloping roof. These are the weatherproofing against the elements, reinforcing for wear and tear and surfacing that protects the inner layers against elements outdoors as well as US rays thrown off by the sun.