There are two popular forms of rubber roofing used on commercial properties: EPDM and TPO. EPDM stands for ethylene propylene diene monomer. It is a synthetic rubber that is black in color. TPO stands for thermoplastic polyolefin. This rubber roofing material is white in color. Rubber roofing can be used on sloped or flat roofs. Rubber roofing costs are well worth the investment. They are durable and also help property owners save on the cost of energy. The rubber reflects the sun, cooling your home. In addition, the cost of materials is low. EPDM is one of the least expensive roofing materials on the market. As there are no seams in rubber roofing installation, it is impervious to water unless the roof is damaged in some way.