The requirements for sound insulation are regulated in DIN 4109. It specifies the requirements for the sound insulation of components of rooms in need of protection and for the permissible sound levels in rooms in need of protection in residential and non-residential buildings. The aim is to protect people in living spaces from unacceptable noise.
The protection goals in terms of noise protection must be determined in advance between the planner and the building owner, as several sets of regulations exist side by side. Especially in buildings with several units, high requirements apply according to the state of the art, which in particular concern the sound transmission between the units, i.e. also the transmission via false ceilings. DIN 4109 regulates the absolute minimum standard, which is considered outdated today. Planners should use the increased values according to DIN 4109 Supplement 2 or VDI Guideline 4100 as the absolute minimum standard. The Dega Recommendation 103 of the German Society for Acoustics can also be helpful in this respect.
Sound can be transmitted as airborne sound or impact sound. Protection against airborne noise increases with an increase in the area-related mass, which is determined by the thickness and bulk density of a component. In principle, concrete as a heavy building material provides very good conditions for the containment of airborne noise. An improvement in impact sound insulation is hardly achieved by increasing the area-related mass. A double-shell construction is far more effective in this respect. Floating screed is particularly effective as a second shell. It is acoustically decoupled from the ceiling and wall construction by impact sound insulation and edge insulation strips.
Image: Noise sources internal and external - baukobox
Noise sources are:
Source: bauwion
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