. Air tightness:Excellent air tightness can reduce the heat loss caused by convection and improvethe building energy efficiency. . , Water tightness: Excellent waterproofing and tight covering to protect buildings from erosion ofwater vapor and rain water. . Breathability: To help the effective discharge of water vapor in the building envelope system,solve the problem of moisture condensation to be moisture-proof and protect the insulation layer.. Durability: The excellent durability ensures stable thermal insulation effect of the building, so thatthe building can save energy more persistently.