Breathable buildings materials

摘要

A breathable building membrane (1) includes an under layer (3) formed of a microporous polymeric film and a top layer (5) formed of a filamentous polymeric fabric which is bonded to the under layer, said under and top layers (3 and 5) being disposed in overlying relationship and being stabilised respectively against heat degradation and ultra-violet light degradation (Figure 2). The top layer (5) may be provided with a moisture vapour permeable reflective coating (5c) (Figure 7).