EPDM, a synthetic rubber made from ethylene and propylene, is the most common choice for single-ply, flat roofing systems. Elastic and flexible, this roofing material can handle temperature variations.

Rather than being welded closed, the seams on an EPDM roof are secured using adhesives. EPDM synthetic rubber roofing can last over fifty years, or nearly twice as long as Polyvinyl Chloride (PVC) or Thermoplastic Polyolefin (TPO) roofs.