Impact sound in timber construction

Sustainable construction requires maximum sound insulation with minimum use of resources. This requires floor structures with ecological building materials and good impact sound insulation. With our impact sound test stand, we develop new efficient floor structures.

With heavy concrete ceilings and Impact sound insulation is easy to achieve good sound insulation. This construction method scores poorly in terms of sustainability and construction process. construction process. Much better are lightweight floor slabs made of wood. For sound insulation sound insulation, these are weighted with an additional mass according to the weighted down. Wood-concrete composite floor slabs, heavy underlay floors or fillings are common. Unfortunately, these measures worsen the carbon footprint of the wood climate balance of timber construction and deconstruction.

For our customers we test innovative floor constructions in our impact sound test stand with comparative measurements. The impact sound test stand is the result of several bachelor theses at the Bern University of Applied Sciences.

Impact sound measurements in the test rig

With the we measure the change in impact sound insulation due to the adjustment of individual the adjustment of individual layers. In this example, a proven floor floor structure serves as a reference variant. In each of two variants, one layer is changed and the influence on the sound insulation values and the life cycle assessment is are analyzed.

The test method is based on the standard ISO 16251-1. A standard hammer mill is used as the impact sound source. On the the underside of the carrier plate, the structure-borne sound level is determined by means of acceleration which is given as the velocity level Lv. From the determined The ΔLv to the test ceiling is formed from the determined fast level of the reference ceiling. The results in a statement on the change in impact sound insulation compared to the reference ceiling. The support plate is softly supported in the four corners and thus decoupled from the decoupled from the test rig. Above this lies the test ceiling with dimensions of 100 cm × 100 cm. The vertical natural frequency of the test specimens on the elastic supports is individually tuned to 8 Hz for each test specimen. The acceleration is measured by several uniaxial piezoelectric accelerometers at ten positions. accelerometers at ten positions. The signals are Fourier transformed and filtered in one-third octave bands as rms values. values. Vibration calibration is performed according to the requirements of ISO 16063 (all parts).



In unserem Trittschallprüfstand entwickeln wir neue Bodenaufbauten für den Holzbau.

Elastically bound Chippings from Köhnke for sound insulation

Elastic-bonded chippings fill improves the sound insulation and at the same time and at the same time takes over the function of the leveling fill. The inexpensive and and quick to install, replaces the HBV Floor. In addition, there is a a weight saving of approx. 50% compared to concrete. Because of the many Timbatec uses this system for residential and commercial buildings and does not use HBV-Covers.


From the bonded chippings fill, no water escapes. As a rule, it can be applied directly directly onto the wooden ceilings without a separating layer. On delicate substrates or with certain lignature systems, a separating fleece must be laid. This This should be done before any lines (electrical or sanitary pipes). A edge strip is not necessary in principle, but can be used for moisture-sensitive walls or for the subsequent underlayment floors. can already be applied.

Material Thickness: Normally, the fill is applied in a thickness of 50mm to 80mm. Thinner layers (at least 30 mm) bring much smaller improvements in sound insulation. sound insulation; thicknesses greater than 80mm, according to the manufacturer of the binder, have no significant benefit.

Drying out: The water-based binder requires good drying conditions. The temperature should be at least 15° C and good ventilation must be ensured. must be ensured. If the climate is poor (high humidity and/or cold and/or cold temperatures), in the worst case no drying takes place at all. take place. When the chippings layer is thoroughly dry and appears firm when walked on, the other layers can be laid.

General: Since this system is based on a 4-8mm chippings, slight height differences are are to be expected. Therefore, a fine leveling layer must be provided for dry floors (dry fill) must be provided. The bonded chippings Köhnke K 102-CH is a leveling layer and has no solid surface. A site operation is therefore only possible to a very limited extent; at best, wooden wooden boards must be laid for protection.


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