Waterproof vapour membrane, laid on the base layer, to enhance the water tightness of the building at the same time, to prevent indoor wet steam to the thermal insulation layer, protect the insulation erosion, families, and gravels vapour film and thermal insulation layer on the waterproof breathable membrane, can make the wall or roofing water isolation effect is very perfect, and make the retaining water vapor expel through waterproof breathable membrane, protect the envelope thermal performance, so as to achieve the purpose of energy saving.