This Black Polythene Damp Proof Membrane (DPM) is 250mu (1000 gauge) and comes on a 4mtr x 25mtr roll, covering 100m2. It is ideal for use with concrete flooring, acting as an over-site membrane between a blinded hard core bed and the base concrete, or as a sandwich membrane between the base and concrete screed. The membrane is accredited by the British Board of Agrément (BBA: 94/3009) and manufactured using over 90% recycled materials. It is commonly used to protect a building's concrete slab from moisture rising from the foundations and can also be used as a protective surface before laying laminate or wood floors.