The diffusion membrane is WATERPROOF and STEAM PERMISSIBLE.

The diffusion membrane provides the roof with an additional layer of protection, both during and after installation. The purpose of the diffusion membrane is to keep moisture out of your home, prevent water damage and mold.

Diffusion membranes are modern materials that replace roofing cardboard. Roofing membranes are easier to install, cheaper and lighter, and due to their properties, they effectively protect the attic and thermal insulation layer from moisture, wind and dust, as well as leaks due to damage to the roofing.