规定了作为柔性建筑膜（也称为纱布或衬垫）使用的材料的要求，当单独使用或作为其他材料（如绝缘材料）的饰面，以及作为水、热蒸汽或空气控制的控制功能时。

Sets out requirements for materials for use as pliable building membranes (also known as sarking or underlay), when used either independently or as a facing to other materials, such as insulation materials, and as control functions for water, thermal vapour or air control.