Sound insulation for windows

As standard, our windows are available with 30dB (double glazing) or 33 dB (triple glazing) insulating glass. This is sufficient for normal exposure to noise. The higher the value in dB (decibel), the better it insulates against noise. Similarly, the thicker the glass, the better it protects against noise, ideally, 2 glasses of different thicknesses are recommended, in order to stop 2 different frequencies. For example, an 8 mm glass on the outside and a 4 mm glass on the inside will be placed to achieve a sound attenuation of 37 dB.

If your home is located near a railway track or a busy road, the installation of soundproofing glasses is recommended, not only on the facade in question but also on the returns of the other facades. For high noise requirements, here are some tips

  • from 32 dB silicone seal between frame and masonry 
    from 33 dB expansion panel with 1 heavy sheet 
    from 38 dB 2nd sealing ring on the leaf 
    from 39 dB laminated glass with soundproofing film 
    from 40 dB expansion panel with 2 heavy sheets 
    from 41 dB hardwood frame (oak or SIPO)

Attention, all the noise values indicated do not concern the entire window, but the insulating glass (deviation of about 2 dB) These Rw values are indicated for a frequency of 500 Hz and must be corrected by a coefficient (Rw +C) which takes into account airborne noise (dwelling, railway, playground) or a coefficient (Rw+Ctr) which takes into account traffic noise (road traffic, truck, plane, disco). These corrections - which depend on the composition of the glass - can reduce the Rw value by 1 to 3 dB respectively by 4 to 7 dB; So everything is not simple and the comparison between 2 suppliers becomes difficult...

Contact us, we will help you with your project.

Here is an example: a glass of 8-16-4 (glass of 8 outside, air space of 16 and glass of 4 inside) has an Rw value of 37 dB

the correction for aerial noise is -2So Rw +C = 35 dB
the correction for traffic noise is -6So Rw +Ctr = 31 dB.

Think about it, only a difference of more than 2 dB is perceptible to the human ear. To want a window that is very efficient in terms of noise, it must be kept closed; the problem of ventilation must be planned in parallel.