Noise insulation

Noise insulation

What is noise?

Our environment is becoming louder and louder, and private and public transport is constantly increasing. No one is safe from noise. Even quiet locations can be exposed to high noise levels overnight. But: What is noise? Noise is defined as any type of sound that is perceived as disturbing, annoying or painful. Ambient noise consists of a variety of tones of different frequency and intensity. The specific perception by the human ear is taken into account when determining the noise intensity. Lighter tones are subjectively perceived as louder than darker ones. The loudest sound a person can hear painlessly has a sound intensity ten trillion times higher than the quietest. The hearing copes with perception by perceiving a tenfold increase in sound intensity as a doubling of the volume. Handling such large numbers is not very practical, so a logarithmic scale is used. The unit is the decibel (dB) derived from the Bel (B) (1 Bel = 10 decibels), a dimensionless ratio corresponding to the logarithm of 10.

Sources of noise and perception

The following figure shows some typical types of noise with their volume (in decibels) and subjective perception.

Noise insulation Noise sources

Function and structure of noise insulating glass

The noise insulation of insulating glass can be improved with various measures.

  • Increase of the glass mass
    The improvement of the noise insulation by thicker panes in the symmetrical construction alone is not very large.
  • Asymmetrical design
    In the case of insulating glass with an asymmetrical structure, the influence of the natural frequency is reduced. Since coincidence collapses also occur at different frequencies, a significant improvement in sound insulation is achieved.
  • Laminated glass elements
    Intermediate layers of one or more foils produce more flexible shells and thus less pronounced coincidence collapses.  
  • Gas filling in the space between the panes
    Depending on the specific structure, the use of krypton thermal insulation gas and mixed gases of argon/krypton improves sound insulation. SF6 is not used at Glas Trösch (BUWAL recommendation).