​Specifies performance requirements for damp-proof courses and flashing materials of sheet membrane type, for use in building construction. The performance requirements are based on the appropriate test methods from previous Standards, updated and metricated. An impact test originally used for polyethylene has been applied to all damp-proof courses and flashings. Additional tests are provided for shear properties and flexural tensile bond strength. A peel test for assessing the strength of adhesives is also provided.