BS EN ISO 717‑2:2020 pdf download.Acoustics — Rating of sound insulation in buildings and of building elements Part 2: Impact sound insulation.
1 Scope This document a) defines single-number quantities for impact sound insulation in buildings and of floors, b) gives rules for determining these quantities from the results of measurements carried out in one‑third‑octave bands in accordance with ISO 10140‑3 and ISO 16283‑2, and in octave bands in accordance with that option in ISO 16283‑2 for field measurements only, c) defines single-number quantities for the impact sound reduction of floor coverings and floating floors calculated from the results of measurements carried out in accordance with ISO 10140‑3, and d) specifies a procedure for evaluating the weighted reduction in impact sound pressure level by floor coverings on lightweight floors.
The single‑number quantities in accordance with this document are intended for rating impact sound insulation and for simplifying the formulation of acoustical requirements in building codes. An additional single‑number evaluation in steps of 0,1 dB is indicated where it is needed for the expression of uncertainty (except for spectrum adaptation terms). Numerical values of the single‑number quantities are specified where required for calculations. The rating of measurements over an enlarged frequency range is given in Annex A. A method for obtaining single-number quantities for bare heavy floors according to their performance in combination with floor coverings is given in Annex B. Example calculations of single‑number quantities are given in Annex C. The rating of measurements with a heavy and soft impact source (rubber ball) is given in Annex D.
3.6 Standardized A‑weighted maximum impact sound pressure level L' iA,Fmax,V,T A‑weighted maximum impact sound pressure level determined with Fast time‑weighting when measured with a heavy and soft impact source, the rubber ball, and increased by a correction term for room volume and reduced by a correction term for reverberation time and Fast time weighting Note 1 to entry: This quantity is expressed in decibels. Note 2 to entry: For field measurements it is denoted as L' i,Fmax,V,T . Note 3 to entry: It is determined as described in ISO 10140‑3, ISO 10140‑5 or ISO 16283‑2. The reported values are averaged over all receiving points and all source positions.
4 Procedure for evaluating single‑number quantities for impact sound insulation rating
4.1 General The values obtained in accordance with ISO 10140‑3 and ISO 16283‑2 are compared with reference values (see 4.2) at the frequencies of measurement within the range 100 Hz to 3 150 Hz for measurements in one‑third‑octave bands or 125 Hz to 2 000 Hz for measurements in octave bands. The comparison shall be carried out in accordance with 4.3.BS EN ISO 717‑2 pdf download.