This product is an approved blown polythene material suitable for use as a radon barrier damp proof membrane in solid concrete ground floors that are not subject to hydrostatic pressure. It is important to ensure that installation is carried out in accordance with Clause 11 of CP 102: 1973 and the relevant clauses of BS 8000-4: 1989. The material meets the requirements for use as a gas control membrane against radon gas in accordance with the recommendations published by the Building Research Establishment (BRE) and the national building regulations. This product is CPR compliant and CE Approved to EN 13967:2012.