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Heavy tloor impact sound ， Sound pressure distribution ， Spatial distr ｝ butめn ， NatUral freqUenCy in this paper ， spatial distributien of heavy floor impact sound was measured at multiple dwelling houses and a steel house ， At multiple dwelling houses ， there was vertical direction of natural frequency in spatial distrlbution of heavy floor impact sound ． Actually there was natural frequency in a steel house ． But there wasn ' t vertical dir tion of natural frequency in spatial dis し ribution ofheavy noorimpact so ロnd at a ste巳l house ， Standard deviation of 血 eavy floor impact sound le 鴨 l was inquenced ■ ith natural frequency ， 1 ．は じ め に

In this paper, we have examined the forecast of heavy-weight floor impact sound level in the housing using the Finite Element Method (FEM). Analysis object is a heavy-weight floor impact sound of dry double floor construction to the laboratory wall construction. 63Hz band analysis results is included in 65% (within ± 5dB) the difference between the measured and analysis value, the result was good correspondence. In the evaluation of the L-value, prediction of heavyweight floor impact sound of dry double floor using the FEM is a sufficient prediction accuracy.