Tecstr vapor barrier membrane applied to the inside of the envelope insulation layer, strengthen the air tightness and water tightness of the building envelope, can effectively prevent the penetration of water vapor to the insulation layer, in order to maintain the long-term energy saving and heat preservation performance of the insulation material, is committed to improving the building energy saving and green environmental protection performance. It has the advantages of windproof and waterproof, excellent steam insulation, light weight, convenient construction, excellent durability and so on. It is widely used in external walls, metal roofing and wood structure houses and other places.