BUILDING PHYSICS 13 Sound insulation of components without secondary paths as calculation basis Calculation of R’w from the mass of a single-shell separating component in CLT BBS construction design without facing formwork where no test results are available: Component Component length lf Component layers for the flank sound calculation Rw,r assessed air-borne sound insulation in the flank sound calculation Rw,P tested air-borne sound insulation of the complete component Apartment partition wall 3.14 m 5-layered CLT BBS 120 mm (57.6 kg / m²) without assessed mass increase, planking of CLT BBS decoupled by means of vibration mounts 35.7 dB 69 dB Interior wall 3.12 m 5-layered CLT BBS 100 mm (48 kg / m²) with one-sided planking of 15-mm Rigips RF fire protection board, Additional mass 13.5 kg / m² 36.7 dB - Exterior wall (separating cut on the axis of the apartment partition wall) 3.12 m 5-layered CLT BBS 100 mm (48 kg / m²) with one-sided planking of 15-mm Rigips, RF fire protection board, additional mass 13.5 kg / m² 36.7 dB 47 dB* Apartment separating ceiling Area across the room viewed: Ss = 3.12 m x 3.14 m = 9.8 m² 5-layered CLT BBS 150 mm (72.0 kg / m²) with assessed mass increase from the floor assembly with heavy filling (196.0 kg / m²) results in a total mass of 268 kg / m² 57.1 dB Rw,P = 77 dB Ln,w,P = 38 dB * The value was measured with 90 mm CLT BBS and 12.5 mm Rigips RF fire protection board Horizontal sound transmission through the apartment partition wall Calculation of the sound insulation value in consideration of the secondary paths The measured sound insulation value R’w of the apartment partition wall (complete assembly R’w = 69 dB) can be inserted directly in the formula below: The flank insulation values Rij,w are to be calculated: R’w = 32.05 * log ( m'element ) – 18.68 + Kwall type with Kwall type = – 2 dB for large-format elemente 1 R’w = –10 lg ( 10 – 0,1R w + ∑10– 0,1R ij,w ) 1 R ij,w = ( R i,w+ R j,w ) / 2 + ∆R ij,w + K ij + 10 lg ( Ss / lolf ) 3
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