Flexible membranes.

摘要

A flexible membrane for use in a lining for a roof or wall for example to provide a water-excluding but air and water vapour permeable lining for a wall or roof comprises a web (10) of a material impermeable to liquid water but permeable to air and water vapour, a layer of tear-resistant fabric (12) of open structure, the web and the fabric layer being bonded together by an adhesive layer (11) which is non-soluble in water and which is discontinuous, foraminous or porous. The resulting material although flexible has a degree of stiffness.