Three-layer highly-vapour permeable, waterproof and windproof membrane ideal for roof and walls protection along with thermal insulation against adverse weather conditions (wind, rain, snow, dust). Membrane regulates humidity level in the room giving its excess out. Membrane can be installed in both light roof sheathing (laths and counter-laths) and full roof sheathing (OSB, plywood or full boarding). It can be laid directly on insulation layer, without keeping ventilation gap. Membrane is highly resistant to aging.