Flanking Sound Insulation of Timber Walls combined with different Timber Hollow Box Floors

Invited paper

Christoph Geyer

Bern University of Applied Sciences

Monday 1 june, 2015, 12:20 - 12:40

Auditorium 2 (592)

A high quality of the acoustic performance is crucial in multi-storey apartment buildings in Switzerland. To achieve this demanded high level of acoustic performance, it is of vital importance that the construction sector can calculate, within the design stage, the apparent airborne and impact sound insulation in the building. Therefor one needs numbers of the airborne and impact sound insulation of the used lightweight building elements with a high extent of accuracy. To produce such a database, sound insulation measurements were systematically conducted in a test facility for lightweight timber constructions. Both, the direct and flanking sound insulation of separating and flanking elements have been measured. As part of these measurements, the flanking airborne and impact sound insulation of different timber wall constructions were measured in combination with different hollow box timber floors. The measurement results for the flanking sound insulation are presented in terms of the normalized flanking level difference, D<sub>nf</sub> and the normalized flanking impact sound pressure level, L<sub>nf</sub> for each wall construction. These results demonstrate that there are Swiss timber construction systems available that can provide a high level of acoustic insulation including the low frequencies down to 50 Hz.

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