Impact sound

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Impact sound is a special form of structure-borne sound that is caused by the movement of people and animals on a floor .

Even sound , caused by exposure to common household objects on the floor, is treated as footfall, as corresponding sound transmission and impact. Relevant here are mainly washing and dishwashers standing on the ground, air handling units , night storage heaters with built-in fans and sanitary articles as well as manual handling of heavy objects such as furniture across the floor.

As footfall sound radiated to the space portion generated during the described operations is referred to noises. So walking noise is airborne and not structure-borne noise . As a rule, impact sound is also perceived as airborne sound, because after being transmitted as structure-borne sound through walls and ceilings, it is emitted as airborne sound.

A floor structure with screed is usually chosen for footfall sound insulation , supplemented by absorbing fiber boards, foams or fleeces. Where this is not possible, attempts are made to stop the path of the sound through other types of mass (e.g. paving slabs) and to decouple the various layers in the floor.

Reduction of impact noise

Impact sound decoupling of a prefabricated staircase from the staircase walls. The blue boxes are made of a pressure-resistant elastomer . The platform behind (hardly visible) of the precast concrete staircase has small, laterally protruding stub extensions over which the elastomer was placed before the staircase was positioned in the shell with the crane. On each floor, the entire weight of the stairs rests on four elastomer caps, which are built into the stairwell wall or cast and thus completely decouple the footfall sound from the building.

In addition to thermal insulation and wind tightness, good sound insulation is now a key criterion for high-quality buildings. Noise nuisance, which occurs in the form of transmitted impact sound, can have a negative impact on health. Builders or residents have a fundamental, civil law justified claim to adequate noise protection, which is to be guaranteed by building laws and specified standards.

The better individual components are decoupled from one another, the better the impact noise can be contained. Double-shell walls with insulation in between, as well as floors with heat and sound-insulating screed, meet the protection against impact noise that is required today.

In stair construction, too, increasing importance has been attached to adequate sound insulation in the past few decades: To reduce impact noise, the use of soft, springy step coverings and a decoupling of the stair support points from the adjoining walls and ceilings are used. So-called whisper stairs are stairs that have particularly good footfall sound insulation .


Impact sound is generated as structure-borne sound and partially spreads as air-borne sound.

Web links

Wiktionary: Trittschall  - explanations of meanings, word origins, synonyms, translations


Individual evidence

  1. As of 2013