Abstract
An investigation was carried out in a new house row having unsatisfactory sound insulation. The sound intensity method was found very valuable for ranking the room surfaces according to radiated sound power. Two different flanking paths were found. In both cases, identical double structures in adjacent dwellings caused overlapping resonance frequencies and strong flanking at these frequencies. For example, structure-borne flanking via the intermediate floor (160 mm concrete) caused poor sound insulation between living rooms. A light floor covering with a thin flexible blanket below it caused a natural resonance at 500 Hz. The flanking at the problematic frequency range could be reduced by 10 dB, changing the natural resonance frequency in the other dwelling. It can be concluded that symmetrical double structures in adjacent dwellings should be avoided unless experience (e.g. measurement in situ) proves otherwise.
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