Toughsheet Toughsheet Damp Proof Membrane - Black | 4m x 12.5m / 500 micronsCommonly used to protect a building's concrete slab from moisture rising from the foundations. A damp proof membrane or DPM is a versatile product and can also be used for a wide range of applications such as creating a protective surface before laying laminate or wood floors. Toughsheet Damp Proof Membrane Black 4m x 12. 5m 500 microns Made from 100% recycled materials BBA certified Length metre 12. 5 Width metre 4 Thickness gauge 2000 Thickness