In Germany, the sound insulation of windows is divided into noise control classes. The allocation of soundproofing to the rated classes sound reduction and examples of the glazing in the following table:
To calculate the required sound transmission loss of windows is also the appropriate rules to be observed. Depending on the application it comes with the same Immissionsverhältnissen significant differences. Based on a busy road through the design of the window was measured at different sets of rules (source Bavarian State Office for Environmental Protection). In the graph the required sound protection class of the window for a bedroom for different distances (different mean level) of the immission is shown from the middle of the road.
The highest noise control classes are made according to the DIN 4109 [Interior level 25 dB (A)]. According to calculations by the 24th BImSchV are the sound insulation classes sometimes lower by 2 classes, to be adopted as the internal level (upper Reference value) at 30 dB (A).
sound insulation class of windows in different regimes
source: fenster1.de
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