| 摘要 |
The invention concerns a roofing underlay screen (100) including :-an initial layer (102) made of an initial material forming a thermal reflective barrier;-a second layer (108) made of a second woven material stuck to the first layer (102);-a third layer (106) made of a third isolating material, which is stuck to the second layer (108); and-a fourth layer (104) made of a fourth material forming a thermal reflective barrier and stuck to the third layer (106); the first and second layers having microperforations (110) to ensure the permeability for water vapour and impermeability for water and the fourth layer having perforations (112) to ensure permeability for water vapour. ® KIPO & WIPO 2009 |
