EPDM stands for Ethylene Propylene Diene Monomer, a synthetic rubber.  In the RV industry, it is used for roofing and an EPDM roof is commonly referred to as a "rubber" roof.   EPDM has excellent resistance to environmental factors such as Ozone, UV and general weathering, but it is important to keep it clean and maintained.

Repair cuts in the rubber immediately and inspect your roof every spring and fall.  Reseal any areas of roof sealant that are cracked or have broken away.  Being diligent in these inspections can save

Another roof type common in the RV industry is TPO (thermoplastic polyolefin), a single-ply roofing membrane, The name is a bit misleading, because rather than plastic that it appears to be, TPO is actually one of a few different types of rubber, usually a blend of polypropylene and ethylene-propylene rubber. 

A PVC roof is a premium single-ply roofing membrane that costs more than an EPDM roof. A PVC roof features hot-air welded seams that make the membrane pliable and watertight under a variety of extreme weather conditions.