Visqueen High Performance Radon Membrane is an LDPE un-reinforced membrane. Visqueen High Performance Radon Membrane™ is suitable for use in concrete floors not subject to hydrostatic pressure, in accordance with the relevant clauses of IS 325:Part 2:1995 and of BS CP 102:1973 Code of Practice for protection of buildings against water from the ground. The product can be installed as an over-site membrane, either between a sand blinded hardcore (50mm of sand minimum) bed and the base concrete, or layered on top of high-density insulation (25kg/m3) with a concrete screed layered over it.