Soundproofing in our sector area carried out with the following standards:

  • UNI EN ISO 10140-1:2016 Acoustics – Laboratory measurement of sound insulation of building elements Application rules for specific products
  • UNI EN ISO 10140-2:20210 Acoustics – Laboratory measurement of sound insulation of building elements – Part 2: Measurement of airborne sound insulation.
  • UNI EN ISO 10140:4:2010 Acoustics – Laboratory measurement of sound insulation of building elements Measurement procedures and requirements
  • UNI EN ISO 717-1:2013 Acoustics – Acoustic insulation verification in building and in building elements Part 1: Airborne sound insulation


With these standards, products are tested in acoustic chambers consisting of a transmitting chamber and a receiving chamber. A partition is built between the two that does not contribute to the sound insulation of the product. The product to be tested is placed in a special chamber and the difference in levels between the emitting and receiving chambers is measured and a series of calculations carried out according to the standard.

The result is Rw: the index for evaluating the soundproofing power of the partition measured in the laboratory or obtained by calculation (without side transmissions), which expresses the value in decibels of the reference curve at 500 Hz after shifting the curve according to the method specified in standard ISO717.


Soundproofing power of an element. Indicates the difference in sound level that the partition is able to maintain between a disturbing and a receiving environment under controlled laboratory conditions.

Rw = measured in the laboratory

R’w=measured in situ

Decibel = unit of measurement, on a logarithmic basis, for measuring differences.

Normally the soundproofing power of an element is expressed as, for example, Rw 42 (-1;-3) dB.

The values in brackets are the spectrum fitting terms (C, Ctr), introduced to correct the value of the assessment index when it refers to a practical situation in which there is a noise source attributable to pink noise (C) used to describe indoor noise or urban traffic noise (Ctr).

Consequently, the result of a sound insulation index assessment may be expressed, for example, as Rw = 42 (-1, -3) dB, which indicates that the object under consideration has a basic sound insulation performance of 42 dB; if subjected to pink noise, the sound insulation performance becomes 41 dB, while if subjected to traffic noise it will have an insulation equivalent to 39 dB.


For Italy the extensions to the tested sample are taken from UNI/TR 11469

Up to +50% of the window frame AREA the measured value is maintained.

Increasing from 50% to 100% AREA decreases 1 dB

From 100% to 150% -2

Above 150% -3


In special case studies, it is also possible to carry out acoustic intensities’, to visually understand where an element is leaking and to perhaps assess the impact of building modifications.