SOUND INSULATION STRUCTURE AND CONSTRUCTION METHOD OF SOUND INSULATION STRUCTURE

To provide a sound insulation structure reduced in propagation of life noise from an upper floor to a lower floor, with little construction labor, in a building of a wooden framework wall construction.SOLUTION: A sound insulation structure 1 reduces sound propagation from an upper floor H1 of a dwelling H to a lower floor H2, and has horizontal long joists 2 forming the floor F of a floor of the upper floor, a tabular floor substrate material 3 placed on the joists 2 and serving as the substrate of a floor finishing material 31, and a packing material 4 fixed onto an upper face 2a of the joists 2 and set between the joists 2 and the floor substrate material 3. The packing material 4 has a fixing part 41 fixed to the upper face 2a of the joist 2 and multiple projections 42 projected upward from an upper face 41a of the fixing part 41. The multiple projections 42 are formed along the longitudinal direction of the joist 2 with spaces, to thereby form spaces 7 between the joist 2 and the floor substrate material 3.SELECTED DRAWING: Figure 11 【課題】 木造枠組壁工法の建物において、上階から下階への生活音の伝播を施工手間をかけずに低減することができる遮音構造を提供する。【解決手段】遮音構造１は、住宅Ｈの上階Ｈ１から下階Ｈ２への音の伝播を低減するための構造であって、水平方向へ延び、上階の床Ｆを構成する長尺な根太材２と、根太材２の上に設置され、床仕上げ材３１の下地となる板状の床下地材３と、根太材２の上面２ａに固定され、２根太材と床下地材３との間に介在するパッキン材４と、を備え、パッキン材４は、根太材２の上面２ａに固定される固定部４１と、固定部４１の上面４１ａから上方へ突出する複数の突起部４２と、を有し、複数の突起部４２は、根太材２の長手方向へ沿って互いに間隔を開けて形成されることにより、根太材２と、床下地材３との間に隙間７を形成する。【選択図】図１１