Damp proof membranes (DPMs) are essential components in floor construction, designed to prevent moisture from rising through concrete slabs or screeds and affecting floor finishes. DPMs are laid beneath or above the structural slab depending on the build-up, and act as a barrier to ground moisture. Their use is critical in ensuring the long-term performance of floor coverings such as vinyl, wood, carpet, and ceramic tiles, which can be damaged by residual damp.