The value of the airborne sound insulation value (RW,R) indicates the calculated value of the component, e.g. the partition wall or shaft wall, determined in the laboratory, in the case of dry plasters and facing shells, the value is usually considered an improvement value for a solid wall behind it. However, the decisive factor for sound insulation in the installed state is the value of the resulting sound insulation (R'W,R ), which also takes into account the longitudinal sound via the flanking components (i.e. connecting to the lateral, upper and lower edges of the partition wall). Even a flanking component with a low longitudinal sound insulation value (e.g. wooden beam ceiling, lightweight masonry, façade elements, screed running under the partition wall) can greatly reduce the value of the resulting sound insulation (R'W,R). Their determined value must be at least equal to the sound insulation value (erf. R'W), which should/must be achieved for the respective component in the specific installation situation.
To put it simply, it can be assumed that there is sufficient sound insulation without calculation if the calculated value for the partition wall (RW,R) and the calculated values of the assessed longitudinal sound insulation dimensions of all flanking components (RL,w,R) are at least 5 dB above the required or desired sound insulation (erf. R'W).
Note: Sound insulation values (erf. R'W) as minimum requirements are specified in DIN 4109, Supplement 2, and for apartments also in VDI 4100. However, the Federal Court of Justice has ruled in several judgments, most recently in 2012, that DIN 4109 is not a recognised rule of technology for the production of sound insulation in apartments that meets the usual quality and comfort standards. Planners are therefore required to propose better acoustic solutions to the client.
For this purpose, the working aids of the ►Deutsche Gesellschaft für Akustik e.V. (DEGA) can be consulted, which has published a leaflet that deals with a multi-stage system for the differentiated planning and labelling of structural sound insulation between room situations, regardless of the type of building, on the basis of which comprehensive and high-quality advice can be carried out. A sound insulation certificate can also be derived from this system, which can be created on the website with the help of a free Excel tool.
Many manufacturers also offer free sound insulation calculators for the uncomplicated consideration of individual components, e.g. partition walls, taking into account the flanking components, e.g. ►Rigips sound insulation calculator.
Source: bauwion
