BUILDING PHYSICS 19 With these formulas and the related tables shown, the vertical footfall sound transmission in consideration of secondary paths can now be calculated for the illustrated planning example. In this process, respectively the two flank paths Df and DFf must be examined for all four walls of the analysed room, from which eight values result for Ln,ij,w. The following plan excerpt (see Figure 12) shows the analysed room with the flanking walls to be considered for the footfall sound transmission. Figure 12 – Optimised apartment partition wall for the prevention of flank sound transmission PLANIN Gru PROJE Sch Exterior wall 100 160 40 8 CLT BBS 5-layered Heat insulation Battens with EPDM HPL Inter 100 15 Interior wall CLT BBS 3 Battens o 60 70 Apartment separating wall 2x15 Gypsum fibre boards Battens on vibration mounts 30 70 15 Gypsum fibre boards Apartment 1 Apartment 2 Footfall sound: flank 2 Footfall sound: flank 4 120 CLT BBS 5-layered 70 30 2x15 Gypsum fibre boards Battens on vibration mounts 50 Mineral wool 15 Gypsum f 50 Mineral w Footfall sound: flank 1 Footfall sound: flank 3
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