Knauf Insulation TS Knauf Insulation TS

Sound insulation

The world is getting noisier


Optimally insulated for greater comfort

We are affected by noise throughout the day, and often this cannot be avoided.

However, with the right insulation, noise emissions can be reduced and the quality of life in living and work areas can be considerably improved.

With their open pore fibre structure, our Mineral Wool products provide the ideal conditions for absorption and regulation of noise and are therefore ideally suited for comprehensive sound insulation.

Knauf Insulation Sound-teK Products

  • Sound-teK WBD

    Glas veil facing More
  • Sound-teK VWD

    Glas fleece facing More
  • Sound-teK VED

    ECOSE facing More

Know how

Individual sound perception

The characteristic measurement for the perception of sound by the sense of hearing is the acoustic pressure as well as the frequency. The physical unit for acoustic pressure is Pascal (Pa), the one for frequency is Hertz (HZ). This means that 1 Hz = 1 wave per minute.

The frequency determines the pitch, the pressure the volume.

The frequency range of 16 - 16000 Hz (typical range of audible of an human ear) is divided logarithmically into octaves and third-octaves.

Frequence spectrum at octave and third octave band

Sound perception
Octave band fm, octave 31,5 63 125 250 500 1000 2000 4000 8000 16000
Third octave band fm, third octave 31,5 40 50 63 80 100 125 160 200 250

Criteria curve A

A rating curve

The sound perception is individual from one to another on the frequency. For that reason there are defined four different weigthing curves based on the frequency weigthing of acoustic events. The most common curve for frequency-related weigthing of acoustic events is the internationally agreed weigthing curve A. Levels that are rated by that curve are described with the unit dB.

Calculation of A sound pressure level

A sound level curve

Calculation of the A-sound pressure level out of the octave band range, e.g. gas engines, 300 kW, 1.500 * 1/min, 1m at exhaust pipe.

The table shows the differences between A-reated and un-rated levels of an gas engine.

Octave band medium frequence 31,5 63 125 250 500 1000 2000 4000 8000 Sum
measured sound level [dB] 91 92 93 94 95 96 92 88 83 102,3
A-rating -39,4 -26,2 -16,1 -8,6 -3,2 0 +1,2 +1,0 -1,1
rated sound pressure level [db(A)] 51,6 65,8 76,9 85,4 91,8 96,0 93,2 89,0 81,9 99,5

Advantages of Mineral Wool