Rainwater and moisture outside the building can easily make the building wrap insulation layer damp and moldy. Flashspun Hypak™ waterproof breathable building wrap material membrane is used for the curtain wall and weather smart building wrap is laid on the outside of the insulation layer. Our building wrap insulation paper featured by waterproof and breathable can not only prevent the infiltration of rainwater but also allow the water vapor entering the insulation layer to be discharged smoothly. The curtain wall of the building can be adjusted freely as if it can breathe by using this kind of eco friendly building wrap insulation materials.