2016 Volume 81 Issue 730 Pages 1075-1084
The purpose of this study is to estimate the airborne sound insulation performance of partition walls with cross laminated timber panels (=CLT panels). Results of sound insulation experiments in the laboratory are as follows.
(1) In case of a partition wall without slit between CLT panels, its sound transmission loss increases monotonically to frequency up to 3150 Hz band. Regression line formula is applicable in this frequency range with a high correlation coefficient.
(2) In case of partition walls with narrow slits between CLT panels, effect of sound transmission through the slits is not negligible. Especially in frequency range over 500 Hz band, decrease of sound transmission loss appears remarkably compared to the case of no slit. However, this decrease is predictable by a formula with the total length of the slits.
(3) If improvement of the sound insulation performance is required, additional gypsum board wall or CLT panel wall on one side of the CLT wall is effective. This improvement effect will differ due to conditions of the slit between CLT panels and sound insulation materials inside the double wall constructions.
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