ISO 717-1:2013 pdf download – Acoustics – Rating of sound insulation in buildings and of building elements
1 Scope
This part of ISO 717:
a) defines single-number quantities for airborne sound insulation in buildings and of building elements such as walls, floors, doors, and windows;
b) takes into consideration the different sound level spectra of various noise sources such as noise sources inside a building and traffic outside a building;
c) gives rules for determining these quantities from the results of measurements carried out in one-third-octave or octave bands in accordance with ISO 10140-2, ISO 140-4, and ISO 140-5.
The single-number quantities in accordance with this part of ISO 717 are intended for rating airborne 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 single-number quantities are based on results of measurements in one-third-octave bands or octave bands. For laboratory measurements made in accordance with ISO 10140, single-number quantities should be calculated using one-third-octave bands only. The rating of results of measurements carried out over an enlarged frequency range is dealt with in Annex B.
4.3 Sound spectra
The set of sound spectra in one-third-octave bands and octave bands to calculate the spectrum adaptation terms shall be as given in Table 4 and shown in Figure 3 and Figure 4. The spectra are A-weighted and the overall spectrum level is normalized to 0 dB.
4.4 Method of comparison
To evaluate the results of a measurement made in accordance with ISO 10140-2, ISO 140-4, and ISO 140-5 in one-third-octave bands (or octave bands), the measurement data shall be given to one decimal place. 1) Shift the relevant reference curve in increments of 1 dB (0,1 dB for the expression of uncertainty) towards the measured curve until the sum of unfavourable deviations is as large as possible, but not more than 32,0 dB (measurement in 16 one-third-octave bands) or 10,0 dB (measurement in 5 octave bands)
NOTE 1 The spectra of most of the usual prevailing indoor and outdoor noise sources lie in the range of spectra Nos. 1 and 2; the spectrum adaptation terms C and C tr may therefore be used to characterize the sound insulation with respect to many types of noise. Guidelines for the relevant spectrum adaptation terms are given in Annex A.
NOTE 2 Supplementary calculations of the spectrum adaptation terms may also be carried out for the enlarged frequency range (including 50 Hz + 63 Hz + 80 Hz and/or 4 000 Hz + 5 000 Hz one-third-octave bands or 63 Hz and/or 4 000 Hz octave bands). The relevant terms and spectra are given in Annex B. An example of the calculation of the single-number quantity and the adaptation terms is given in Annex C.