Abstract: A sound transmission reduction system for use between a floor or other integer of a building construction and a suitable covering for said floor or other integer includes (I) a rigid single layer substrate of gypsum fibreboard, fibre cement, hardboard, plywood or stabilised reconstituted wood, having a thickness of not more than 14 mm; (II) a single resilient layer having a thickness of not more than 10 mm secured or securable to one surface of said substrate; (III) the resilient layer being secured or securable on its opposite surface to said floor or other integer. The arrangement is such that in use the securing together of the substrate and the resilient layer and the securing of the resilient layer to the floor or other integer provides a reduction of sound transmission through the floor or other integer. A method of reducing sound transmission is also disclosed.