Waterproof, thermal insulation in rolls made of strips of self-extinguishing expanded polyurethane, laminated between two bituminous feltpapers, coupled with an elastoplastomeric polymer-bitumen waterproofing membrane reinforced with glass fibre felt or composite "non-wowen" polyester fabric stabilized with fibreglass, both of which are rot-proof. Consul the technical sheet of the product for the resistance values.