BUILDING PHYSICS 23 Table of abbreviations, sound insulation Rw [dB] Rated sound insulation value of a component without secondary sound paths Ln,w [dB] Rated standard footfall sound level of a component without secondary sound paths Ri,w [dB] Air-borne sound insulation value of the flanking component in the transmitting room Rj,w [dB] Air-borne sound insulation value of the flanking component in the receiving room ∆Rij,w [dB] Improvement value of the flank sound insulation (air-borne sound and footfall sound) achieved through installation levels or stand-alone facing formwork Ss [m²] Surface of the separating component lo [m] Reference length 1.0 m lf [m] Length of the butt joint of the flanking component to the separating component [m] Kij [dB] Joint insulation values for calculation of the flank insulation value Rij,w ∆Kij [dB] Improvement of the footfall sound flank transmission achieved through decoupling elastomers K1 [dB] Factor to calculate the footfall sound flank transmission on the path Df K2 [dB] Factor to calculate the footfall sound flank transmission on the path DFf Ln,DFf,lab,w [dB] Lab value of the footfall sound flank transmission on the path DFf D’nT,w [dB] Rated standard sound level difference of a separating component (requirement for Austria) in the built-in condition with secondary paths; resounding period in the receiving room is considered in it L’nT,w [dB] Standard sound level of a separating ceiling (requirement for Austria) in the built-in condition with secondary paths; resounding period in the receiving room is considered in it m1' [kg / m²] Assessable surface measures of the flanking component (without the mass of potential facing formwork or suspended elements) for the calculation of the joint insulation value Kij m2' [kg / m²] Assessable surface measures of the separating component (without the mass of potential facing formwork or suspended elements) for the calculation of the joint insulation value Kij
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