BUILDING PHYSICS 15 Flank insulation values Rij,w to be considered 1. Flank of apartment partition wall – exterior wall RFf,w: Sound transmission into the flanking wall and out of the flanking wall again into the receiving room RF,w = 36.7 dB Rf,w = 36.7 dB ∆RFf,w = 0 dB (no facing formwork present) KFf = 20 dB (case 1 based on the modular construction method with 125 cm wide CLT BBS wall elements) Ss = 8.6 m² lo = 1.0 m lf = 2.75 m Calculation result: RFf,w = 61.6 dB RDf,w: Sound transmission into the partition wall and out of the flanking exterior wall 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 = 36.7 dB ∆RDf,w = 18 dB (improvement value of a one-sided facing formwork on vibration mounts with double 12.5 mm planking on CLT BBS 125 wall, 90 mm thickness, measuring results from binderholz / Rigips) KDf = 16 dB (case 5) Ss = 8.6 m² lo = 1.0 m lf = 2.75 m Calculation result: RFd,w = 75.1 dB RFd,w: Sound transmission into the flanking exterior wall and out of the partition wall again into the receiving room For the calculation, the path Fd is set equal to Df: RFd,w = 75.1 dB 2. Flank of apartment partition wall – interior wall RFf,w: Sound transmission into the abutting interior wall and out of the abutting interior wall again into the receiving room RF,w = 36.7 dB Rf,w = 36.7 dB ∆RFf,w = 0 dB (no facing formwork present) KFf = 20 dB (case 1 based on the modular construction method with 125 cm wide CLT BBS wall elements) Ss = 8.6 m² lo = 1.0 m lf = 2.75 m Calculation result: RFf,w = 61.6 dB RDf,w: Sound transmission into the partition wall and out of the abutting interior wall 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 = 36.7 dB ∆RDf,w = 18 dB (improvement value of a one-sided facing formwork on vibration mounts with double 12.5 mm planking on CLT BBS 125 wall, 90 mm thickness, measuring results from binderholz / Rigips) KDf = 16 dB (case 5) Ss = 8.6 m² lo = 1.0 m lf = 2.75 m Calculation result: RDf,w = 75.2 dB RFd,w: Sound transmission into the abutting interior wall and out of the partition wall again into the receiving room For the calculation, the path Fd is set equal to Df: RFd,w = 75.2 dB
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