Roofing composites and methods of producing the roofing composites are disclosed. The roofing composites are multi-layer structures in which two layers of the composite structures are bonded to each other by a thermoplastic elastomer composition. The layers are bonded to each other by heat fusing the elastomer composition in one embodiment. The composite structures have a variety of uses, including uses in construction materials such a roofing membranes, interior and exterior siding, and wall coverings.