Damp proof membrane (DPM) is a standard requirement when fitting Celotex and Polystyrene insulation flooring solutions. This Damp proof membrane (DPM) should be used below the insulation of a concrete floor to prevent moisture ingress. Dependant on your specification, you may be required to use two layers of membrane, one below the insulation and one above. Please check this with you local building control prior to starting any works. Roll Size 250MUx4x25M (1000 Gauge)
