Impact sound insulation

Impact sound is the structure-borne sound excitation of ceilings and stairs. In this process, sound waves are conducted through these components into other rooms. Impact sound can also penetrate over the flanks, from the ceiling through the walls. Measures to reduce the transmission of this type of sound are called impact sound insulation.

More about impact sound insulation

As a rule, the floor structure has the task of reducing the direct transmission of structure-borne sound via the load-bearing ceiling construction. To achieve this, the floor structure must be decoupled from the raw ceiling.

The effect can be further enhanced with an additional underblanket.

Impact sound insulation is usually between two and 5 millimetres thick. However, there are also TSDs up to 15 millimeters thick.

Suitable materials for impact sound insulation are, for example:

• polyurethane (PU) insulation boards
• wood fibre boards
• glass or mineral wool insulation boards

, etc.Sound

engineering terms:

Rated standard impact sound level Ln,w

describes the impact sound insulation of a ceiling without sound transmission via the flanking walls.

Rated standard impact sound level in construction L ́n,w

describes the impact sound insulation of a ceiling, taking into account the sound transmission via flanking components.

Equivalent assessed standard impact sound level of solid ceilings Ln,w,eq

describes the standard impact sound level of solid ceilings without ceiling coverings and ceiling cladding and without taking into account sound transmission via flanking components. It serves as an input value for the prognosis of the standard impact sound level of solid ceilings with ceiling coverings and/or cladding, also taking into account flanking components.

Rated impact sound reduction ΔLw

is an individual indication of the improvement of the equivalent weighted standard impact sound level by ceiling coverings and/or suspended ceilings. By adding the equivalent weighted standard impact sound level with the weighted impact sound reduction, the weighted standard impact sound level Ln,w of the ceiling alone is obtained without secondary path transmission via flanking components.

Notes on planning

Measures for air and impact sound insulation for floors:

1.) Ceiling coverings

• Execution of floating screed (flowing screed, prefabricated screed) with soft-springy insulation layers between the floor and the raw ceiling.
• In the case of connections to the room walls, sound bridges should be avoided by edge insulation strips.
• Weighting the upper side of the ceiling, e.g. due to a fill, is advantageous in terms of sound technology.
• Soft-sprung floor coverings such as carpets can help to achieve further improvements in sound performance, but may not usually be counted towards the proof of minimum impact sound insulation in residential construction.

2.) Ceiling cladding

• with a substructure (battens, metal profiles, spring rails, spring brackets, suspension) suspended ceilings attached directly to the raw ceiling, e.g
.
• cantilevered ceiling systems made of gypsum boards, with fibre insulation inserted into the cavity, without direct connection to the load-bearing ceiling construction

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