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Underlay for engineered floor (especially good to put on concrete floors) - condition new (packed and unused) 30 sq m coverage - retail price £150. Timbertech underlay (Now rebranded as Acousta 3mm) is one of the highest quality underlay materials on the market. It compromises a high-density rubber core with an integrated fleece and aluminium vapor barrier. It is ideal for domestic and contract installations. The aluminum barrier protects wood flooring and laminates against moisture damage caused by residual dampness migrating from a concrete sub-floor. The high-density rubber core allows for heat transfer from underfloor heating while providing stability to your floor, preventing unwanted movement. It's also very effective when leveling is required. The excellent compression resistance allows for heavy furniture and traffic while providing good joint support. Location Kingscote Road, London, Greater London, W4 5LJ what3words