BUILDING PHYSICS 8 The following illustrations show the various secondary sound paths depending on the construction situation: Figure 4 – Schematic diagram of the contributions to the sound transmission in timber construction Source: Vibro-acoustics research project Model for calculation according to DIN EN ISO 12354 The calculation of single-number ratings of the sound insulation, R’w and of the standard footfall sound level L’n,w in construction is based on the transmissions paths shown in Figure 4 according to the following equations: The footfall sound flank path DFf, going into the floor screed and, via the flanking wall in the transmitting room, down into the flanking wall in the receiving room is not considered yet in the normative calculation according to EN 12354. Acoustics predictions were compared to construction site measurements and a substantial effect of this transmission path can be seen (vibro-acoustics research project). In this planning brochure, the corresponding predictive model is described, which is illustrated in detail in the calculation example provided. Planning notes for sound insulation The table below shows recommendations for the sound insulation of apartment ceilings and partition walls for multi-storey buildings for residential housing based on DIN 4109, supplement 2 and respectively ÖNORM B 8115. The data refers to the construction situation including all secondary sound paths. Building part Austria Germany Apartment partition wall D’nT,w ≥ 55 dB R’w ≥ 55 dB Apartment separating ceiling L’nT,w ≤ 48 dB Minimum requirement: L’n,w ≤ 53 dB Enhanced requirement: L’n,w ≤ 46 dB R’w = –10 lg ( 10 – 0,1R w + ∑10– 0,1R ij,w ) with ij = Ff, Fd, Df L’n,w = 10 lg ( 10 0,1L n,w + ∑10 0,1L n,ij,w ) with ij = Df, DFf 1 2 Footfall sound transmission Vertical air-borne sound transmission Horizontal air-borne sound transmission
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