FIELD: construction.
SUBSTANCE: invention relates to thermoplastic roofing membranes and pertains to a multi-layer roofing membrane. Membrane comprises a first thermoplastic layer and a second thermoplastic layer, the second layer comprising at least two sub-layers, which are formed by coextrusion, wherein at least one of said layers comprises expandable graphite.
EFFECT: invention enables to create a roofing membrane based on thermoplastic polymers by extrusion, while enabling heat sealing of membranes to form continuous waterproofing on the roof surface and having a fire resistance standard.
7 cl, 4 dwg
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