Single Ply Thermoplastic single-ply membranes are revolutionizing the commercial and industrial roofing industry. They represent the fastest growing segment of the U.S. roofing market over the past five years. The PVC product is a reinforced membrane with tough solvent-or-hot-air welded seams. This material has excellent durability and dimensional stability. The TPO product advances the category yet another step by combining the hot-air welding benefits of EPDM and the more traditional single-ply material. Both PVC and TPO are aesthetically pleasing, lightweight, and highly resistant.