Sonic Gold 5mm Underlay is for wood and laminate flooring. It has a built in self adhesive gold foil moisture membrane (dpm). This ensures the prevention of moisture rising from the subfloor and helps to join adjacent underlays. Suitable for concrete and wood subfloors. At 5mm thick it can level out subfloor imperfections and provide great sound reduction. It’s produced from PE Foam which is CFC and HCFC free and, 100% recyclable. *Stock can sometimes be a different colour foam from the image shown as this is dependant on the foam availability at the time of manufacture.