Roofing membranes

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B - Operations, Transporting

32

B

20/20.2

B32B 7/12 (2006.01) B32B 7/02 (2006.01) E04D 5/10 (2006.01)

Patent

CA 1224618

ABSTRACT Waterproofing membranes are disclosed comprising a shrinkable polymer film bonded to a foil layer by a layer of thermoplastic adhesive having sufficient bonding strength below the shrinkage onset temperature of the polymer film to inhibit relative movement between the film and the foil and having sufficient plasticity above the shrinkage onset temperature of the polymer film to permit relative movement between the film and the foil. In a preferred embodiment, the membrane is made self adhesive by including a layer of an adhesive material on that surface of the foil opposite the layer of the thermoplastic adhesive.

452176

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