Water tightness of Breawarf breathable underlay membrane
　　Thanks to the prominent  water proof performance,  Breawarf breathable underlay membrane can wrap building tightly , protect the building from corrosion  of water  vapour and rain. Guarantee good insulat ion performance and well  durability of building, enable the building to be more energy conservation and environmental protection.

Permeability of  Breawarf breathable underlay membrane
　　Breawarf breathable underlay membrane paves outside of the insulation system, enable the water vapour inside the insulation system to exhaust, solve the condensation problem, protect the insulation system.When condensation appears because of the temperature difference, the water  drop will forming at  the top of roof  or surface of wall, incursion of such water  drop into the insulation system will result  in the lower thermal  efficacy and shorter duration of  building.  After pave Breawarf breathable membrane, water vapour will exhaust easily . The water drop condensate inside the roofing tiles will drop to the Breawarf  breathable underlay membrane, flow away from the drain tank.

Reduce construction cost
　　Breawarf breathable underlay membrane can protect the insulation system,  saving the fine concrete or the film waterproofing materials which regularly paved on top of  insulation system so that  to reduce theconstruction cost.