Wood Floor+ 20m-square clear polyethylene vapour barrier is 4m wide & 5m in length. This damp proof membrane is a polyethylene sheet that can be used as a vapour barrier between a concrete sub floor & underlay, ensuring no damp ingress into the underlay & flooring. The damp proof membrane is supplied in a single sheet & is ideal to be used with a number of floor coverings, from Laminate Flooring to Solid Wood & Engineered Wood flooring.