Damp proof membranes

A damp proof membrane (DPM) is a polythene sheet used to prevent moisture rising through concrete slabs and screeds. It forms a barrier against ground moisture in both new builds and refurbishment work. In modern construction, DPMs are laid beneath concrete floors or integrated with damp proof courses to stop capillary action. On retrofit projects, they may also be applied above slabs where original protection is absent or damaged. There are a range of branded options available, including products by Visqueen and Wrekin.

A typical damp proof membrane for floors comes in 1000 gauge (250 micron) or higher, depending on site requirements. When laying a damp proof membrane concrete floor system, always overlap joints and tape them to maintain integrity. DPMs are usually also compatible with insulation boards and underfloor heating systems – check the specs to find out how products can work together.

Check Buildbuddy for the best prices on damp proof membranes from leading UK suppliers.