US Patent 8241446 Thermoplastic single ply protective covering

Methods of making a single ply protective covering and of installing such a covering are disclosed. The method of making includes (a) providing a single ply thermoplastic roofing membrane, and (b) coating the single ply thermoplastic roofing membrane on its bottom surface with a 1-50 mil layer of a pressure sensitive adhesive mixture consisting essentially of polyisobutylene and at least one polymer comprising conjugated diene monomers. The method of installing includes (a) providing a single ply thermoplastic roofing membrane, (b) cutting the single ply thermoplastic roofing membrane to a selected size, (c) positioning the single ply thermoplastic roofing membrane on a portion of a roof, and (d) bonding the membrane to the roof.