Abstract
The floor impact sound insulation grade of the general wooden frame structure against the heavy impact source is between L-75 and L-80. In terms of the sound environment for multiple dwellings, it is a problem which the wooden frame structure has. We examined in various and experimental ways with a wooden model of the real size for the purpose of improving the floor impact sound insulation grade. As a way to improve the grade, we do not take any way into consideration which requires change of the conventional methods of construction, we instead fixed eyes on the high stiffenss of each section of struture. As a result, we obtained the floor impact sound insulation grade of L-55, which is equivalent to that of the 150 mm-thick concrete floor, by employing improvements of each specific section mentioned belows ; (1) 220 mm-thick panels, to which high-stiffness is added, should be used as a floor construction. (2) Adhesives and nails should be used together for installment of wall materials in a room below the floor construction. (3) For a room below the floor construction, a vibration-proof, independent and sound isolated ceiling should be installed.
