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Since the publishing of DIN 4109 in November 1989, requirements and demands for sound insulation have been regulated. This standard aims to protect people against unacceptable nuisances of sound transmission.

In the field of underfloor heating the impact sound insulation concerns planners, trade and building-owners.

Following components have to be considered:

  • Rough cement floor
  • Impact sound insulation
  • Screed
  • Edge insulation

(soft elastic floor coverings may not be considered due to the possible interchangeability).The calculation procedure of DIN 4109 uses the following terms:

Ln, W, eq, R    =    equivalent evaluated standard impact sound insulating level

Δ Lw, R        =     impact sound improvement dimension
L’n, W        =    evaluated standard impact sound insulating level

The equivalent standard impact sound insulation level considers the mass of the rough cover in relation to the surface (solid cover).
(DIN 4109, supplement 1, table 16)

With the impact sound improvement dimension the impact sound insulating effect of the cover coat (insulating material) is considered.
(DIN 4109, supplement 1, table 17)

The evaluated standard impact sound insulating level is the requirement of DIN 4109, supplement 2, table 2 + 3.

Es wird nach folgenden Kriterien unterschieden:

It is distinguished according to the following criteria:

Criteria A:

Sound transmission from an adjoining living or working area:

minimum demands = 53 dB

proposal for increased sound protection = 46 dB

Criteria B:

Sound transmission from own living or working area:

minimum demands = 56 dB

proposal for increased sound protection = 46 dB

On calculating the evaluated standard impact sound insulating level Ln, w, R, a correction value of 2 dB has to be considered.

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