Abstract
Damping materials were applied to the floor of a four-story platform frame house in order to decrease heavy floor impact sound levels. Two types of viscoelastic layers were attached to the floor ; that is, two kinds of non-constrained viscoelastic layers and a constrained viscoelastic layer. Applying non-constrained viscoelastic layers to the floor resulted in the reduction of not only vibratory velocity levels of the floor and ceiling, but also heavy floor impact sound levels. The constrained viscoelastic layer had little acoustic effect. The increase of the stiffmess and damping of the floor may simultaneously affect these results. Thus further investigation is needed to clarify the mechanism of decreasing heavy floor impact sound levels by the use of damping materials.
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