BUILDING PHYSICS 18 The factor K1 required for this purpose besides the rated standard footfall sound level Ln,w can be found in the following table as dependent on the construction variant: Corrective summand K1 for consideration of the flank transmission on the path Df. Wall arrangement in the receiving room Ceiling assembly CLT BBS ceiling CLT BBS wall K1 = 4 dB The lab value for the flank transmission of the footfall sound on the path DFf, Ln,DFf,lab,w is shown shaded in grey in the right column of the table below, as dependent on the wall structure and floor assembly. In the table that applies under lab conditions, the value was referred to as Ln,DFf,w. Wall assembly in the transmitting and receiving room Floor screed assembly Footfall sound transmission on the paths Dd + Df: Ln,w + K1 in dB 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 >5 Ln,DFf,w in dB a) ZE / HWF 1110109876554433221111110 n = 1 46 b) ZE / MF 101098765544332211111100 n = 7 45 σ σ = 1.5 c) TE 8765544332211111100000 n = 6 42 σ σ = 0.9 Floor screed assembly: a) ZE / HWF mineral-bound screed or cast asphalt on soft fibre timber footfall sound insulation boards Rim insulating strips: > 5 mm mineral fibre or PE-foam rim strips b) ZE / MF mineral-bound screed or cast asphalt on soft fibre or PST footfall sound insulation boards Rim insulating strips: > 5 mm mineral fibre or PE-foam rim strips c) TE dry screed on mineral fibre, PST or soft fibre timber footfall sound insulation boards Rim insulating strips: > 5 mm mineral fibre or PE-foam rim strips
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