EN ISO 717-2:2013

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Procedure for evaluating single-number quantities for
  impact sound insulation rating
5 Procedure for evaluating the weighted reduction in impact
  sound pressure level by floor coverings on
  bare heavy floors
6 Procedure for evaluating the weighted reduction in impact
  sound pressure level by floor coverings on
  lightweight floors
Annex A (informative) - Additional weighting procedure
Annex B (informative) - Procedure for evaluating the equivalent
        weighted normalized impact sound pressure
        level of bare heavy floors
Annex C (informative) - Examples of the evaluation of a
        single-number quantity
Bibliography

ISO 717-2:2013: 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 140-7, and in octave bands in accord-ance with that option in ISO 140-7 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; 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 ISO 717-2:2013 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 for the expression of uncertainty (except for spectrum adaptation terms).The required numerical values of the single-number quantities are specified according to varying needs.The rating of results from measurements carried out over an enlarged frequency range is described in an annex.A method for obtaining single-number quantities for bare heavy floors according to their performance in combination with floor coverings is described in a second annex.An example of the calculation of a single-number quantity is given in a third annex.