Profile: Steven's Roofing Systems, Inc. manufactures thermoplastic roofing membranes for commercial, industrial, and institutional applications. Our brands include Stevens EP Stevens EV and Stevens Hypalon. These are offered in a variety of thickness and architecturally pleasing colors. Our Stevens EP brand of TPO is a reinforced thermoplastic polyolefin based roofing membrane, formulated from a proprietary compound of ethylene propylene rubber & polypropylene. It is suitable for virtually all commercial, industrial and institutional applications, both for new construction & re-roofing. We also offer Stevens insulators, fasteners, accessories and edge metal.