DPM Black Heavy Duty Polythene  Made from 100% recycled polythene material our PIFA standard and BBA accredited damp proof membranes come in a choice of three standard gauges, 1000 gauge (250 Micron thick), 1200 gauge (300 Micron) and 2000 gauge (500 micron). The 1200 gauge is fully compliant with the minimum standard required for damp proof membranes as stipulated in the UK Building Regulations. Damp Proof Membranes provide a barrier for moisture, usually used within building foundations it can also be used for a range of other damp proofing applications. DPM is suitable for use below concrete floors not subject to hydrostatic pressure. All DPM are CE marked to EN 13967 2012.