Kingway waterproof breathable membrane, applicable to the curtain wall, pressure, cast steel, steel type and exterior wall and sloping roof, ventilation, from (300-3000 g/m2/24 h), products in the above the shop roof insulating layer, strengthen building water tightness, at the same time, its unique ventilation function, make water successful eduction, thus effectively keep the building service life, have heat preservation, saving energy, improving the function of the living environment.