A damp proof membrane (DPM) is a waterproof or moisture-resistant barrier typically installed beneath a building's floor or within its walls. The DPM helps to prevent moisture from penetrating or rising which, in turn, protects the structure and interior from dampness and related problems. You’ll find a wide range of DPM products available at Travis Perkins, including butyl tape, self-adhesive, multi-purpose tanking membrane, and UV Façade Membrane.