1)    Breathable Membrane is a water resistant membrane but with high vapour permeability, use as diffusion open roofing felts under pitched roof tile or vapour permeable barrier housewraps on timber frame walls

      1    Breather membrane functions as a weather-resistant barrier, preventing rain from getting into the roof or wall assembly while allowing water vapor to pass to the exterior. 

      2    Breather membrane may also serve as an air barrier if it is sealed carefully at seams.

      3    Breathable Membrane have good "water resistance", good "water vapor permeability", and good "air barrier properties".

 2)  breathable roofing membrane      Specification