reflective waterproof underlayment polypropylene breathable membrane is also called roofing felt breathable membrane. It is a function film which is laid on the thermal insulation layer.It is applied to the comp-osite outer wall or sloping roof of the wall curtain, profiled steel sheet , steel (wood) structure, masonry and so on. lt has thermal insulation and waterproof breathable function. Through the building envelope ins-ulation layer coated on the building to reduce water and air penetration, while also foster the building envelope and indoor humidity can be discharged effectively prevent mold and skeptical of water generated in the wall and roof to ensure insulation material performance of the play, so as to achieve energy efficiency,improve building durability, retaining the role of human settlements. Kingway roofing membrane is produced by recyclable and pro-environment material with the method of stitching to compound the high density spun-bond fabric and pp. It is waterproof, high tensile, anti-UV, light weight and easy to be paved.