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Abstract: In this paper the influence of slits on sound reduction index of double steel frame partitions with and without mineral wool in the cavity was examined. It was shown that the sound insulation of the partition is strongly dependent on the relative position of the slits on each steel frame. As could be expected, the reduction in sound insulation due to slits is lower in partitions without mineral wool in the cavity, since the effect of slits is more important in the case of partitions with high sound insulation. [Copyright &y& Elsevier]

Abstract: To avoid the undesirable effects of a faulty sealing of outlet boxes, it is common to insert a gypsum board layer in the middle of a double frame partition. In this paper, measured sound reduction index data for double frame partitions, with and without a gypsum board layer insert, are presented. The results obtained show that the sound insulation decreases at low frequencies due to the presence of the internal layer. The weighted sound reduction index, which is strongly affected by the low frequency sound insulation, decreases by 7–8dB. Since these degradations are greater than those resulting from small gaps in partitions, it can be concluded that the insertion of a gypsum board layer in the middle of a double frame partition is not a suitable solution to the undesirable effects of faulty sealing of outlet boxes. [Copyright &y& Elsevier]