The HURDEX superdiffusion membrane is a high-quality three-layer waterproofing of the roof with a high level of vapor penetration, which protects the thermal insulation layer from moisture from the outside and does not create obstacles for the removal of water vapor from the inside, due to which the installation of the membrane does not require an additional distance between the film and the insulation layer. HURDEX superdiffusion membrane is used for additional waterproofing of the under-roof space of the roof. It consists of two layers of polyester fabric and a reinforcing film made of thermoplastic polyurethane, which provides high water vapor permeability and reliable waterproofing of the roof with a small slope.