The diffusion membranes are membranes that have vapour-permeable properties, wicking moisture away from the interior and protecting against external weather conditions.
Air and water vapor permeable membrane; made of 100% polypropylene. Used as a separation layer and as protection against the ingress of small parts of the substrate, e.g. in an inverted roof system. Chemically and biologically neutral; compatible with bitumen and polystyrene; resistant to acids and alkali. Vapour-permeable membrane for use in green roof systems.