Size: 1x50m ONDUTISS AIR 100 is a 100 gsm roof membrane preserve the waterproofing of roofs and buildings. Since it is permeable, it lets water vapour escape. Due to its properties, this membrane can also be used as a housewrap for any timber frame, block work, concrete or insulation. The ONDUTISS range of products are high vapour permeable membranes, suitable for cold and warm roof applications. You should use ONDUTISS as the membrane under roofing products or as a housewrap. ONDUTISS AIR: A RANGE OF HIGH-PERFORMANCE ROOF MEMBRANES Discover the ONDUTISS AIR range of roof membranes: waterproof, lightweight and effective products. ONDUTISS AIR roof membranes consist of a layer of polypropylene between two sheets of non-woven polypropylene, making them vapour-permeable. This guarantees a breathable membrane that protects against humidity, wind and condensation. These roof membranes can be installed to many types of roof in both new-build construction and renovation: garden sheds, summerhouse, garden office or gazebo.