SilentWool Flooring UnderlaymentSheep Wool Insulation's SilentWool Floor Underlay is a dense, pure wool acoustic felt designed to go under timber, engineered wood and laminate floors from the subfloor. It has a density of 100kg per cubic metre allowing it to provide a robust layer of supreme cushioning on which to lay the hard flooring and protect it from the substrate underneath. It lays onto a flat surface such as screed, concrete, or plywood. It also provides acoustic insulation,