SOUND INSULATION FLOOR STRUCTURE, AND METHOD FOR REDUCING FLOOR IMPACT SOUND

摘要

PROBLEM TO BE SOLVED: To provide a sound insulation floor structure which is high in sound insulating performance for floor impact sound and in particular can efficiently insulate heavy floor impact sound despite of its light weight and simple structure.SOLUTION: In a sound insulation floor structure, an intermediate layer 3 formed of a plurality of floor joists 4 arranged in parallel at intervals and a buffer layer 5 arranged alternately with the floor joists 4 is interposed between a floor underlayer material 2 disposed on horizontal members 1 and a floor finishing layer 9. The buffer layer includes a buffer material and is a layer obtained by compressing a layer to be compressed having a larger thickness than that of the floor joist to the thickness of the floor joist. The horizontal members and the floor joists are arranged in parallel to each other, and the floor joists are arranged so that they are positioned respectively above the horizontal members.