BUILDING PHYSICS 16 3. Flank of apartment partition wall – ceiling RFf,w: Sound transmission into the flanking ceiling and out of the flanking ceiling again into the receiving room RF,w = 57.1 dB Rf,w = 57.1 dB ∆RFf,w = 0 dB (no suspended ceiling present) KFf = 5,3 dB (case 3, m1’ = 268 kg / m², m2’ = 57.6 kg / m²) Ss = 8.6 m² lo = 1.0 m lf = 3.14 m Calculation result: RFf,w = 66.8 dB RDf,w: Sound transmission into the partition wall and out of the flanking ceiling again into the receiving room RD,w = 35.7 dB (calculation based on the mass of the unfinished CLT BBS 125 wall elements, 12 cm thickness) Rf,w = 57.1 dB ∆RDf,w = 18 dB (improvement value of a one-sided facing form- work on vibration mounts with double 12.5 mm plank- ing on CLT BBS 125 wall, 90 mm thickness, measuring results from binderholz / Rigips) KDf = 14 dB (case 4) Ss = 8.6 m² lo = 1.0 m lf = 3.14 m Calculation result: RDf,w = 82.8 dB RFd,w: Sound transmission into the flanking ceiling and out of the partition wall again into the receiving room For the calculation, the path Fd is set equal to Df: RFd,w = 82.8 dB 4. Flank of apartment partition wall – floor The related secondary paths ij = Ff, Df, Fd are not considered, since the sound transmission is prevented structurally by • heavy floor assemblies with concrete floor screed • correct installation of the apartment partition wall, as shown in the cut, on the unfinished ceiling using the screed rim insulating strip
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