Flexible sheets for waterproofing. Definitions and characteristics of underlays - Underlays for walls Ingestion-build-111333 In BS EN 61649

In BS EN 61649

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Flexible sheets for waterproofing. Definitions and characteristics of underlays - Underlays for walls Ingestion-build-111333 In BS EN 616491 Scope This European standard specifies the characteristics of flexible sheets for underlays for walls which are to be used in walls behind outside wall coverings in order to avoid penetration of wind and water from outside. It specifies the requirements and test methods and provides for the evaluation of conformity of the products with the requirements of this document.