由于幕墙保温体系外的防水层不透汽、强度低等不足之处,实际上起不到对保温体系的防护作用,从而引入新型材料——防水透汽膜。文章介绍了防水透汽膜的工作原理,研究了防水透汽膜的性能指标及检测方法,调研了防水透汽膜在工程中的使用情况及目前的研究情况。 As the curtain wall insulation system outside the impermeable layer of water vapor, low strength and other inadequacies, in fact, can not play a protective effect on the insulation system, thus introducing a new material - waterproof breathable membrane. This paper introduces the working principle of water vapor permeable membrane, investigates the performance index and detection method of water vapor permeable membrane, investigates the use of water vapor permeable membrane in the project and the current research situation.