Airborne and impact sound insulation

Sound insulation between rooms

CadnaB enables precise calculations of airborne and impact sound insulation between different rooms in accordance with DIN 4109 or ISO 12354. Both vertical and horizontal sound transmission scenarios are possible.

With CadnaB, complex transmission scenarios can be analyzed in detail—based on individual transmission paths. Various target values can be used for calculations, such as the weighted apparent sound reduction index R'w, the weighted normalized level difference Dn,w, or the weighted normalized impact sound pressure level L’n,w, optionally with spectrum adaptation values. In addition to single-number ratings, CadnaB also provides spectral results that can optionally be compared with spectral requirements.

This flexibility is particularly helpful when planning sound insulation measures in residential and non-residential buildings, as they have different requirements. These building acoustics requirements can be directly compared with the calculated results in CadnaB.

Sound insulation against outdoor sound

CadnaB provides comprehensive features for calculating sound insulation against external noise through facade walls. Both the exterior walls themselves and individual elements such as windows, ventilation components, and doors are taken into account.

Depending on the selected calculation standard, the analysis is based on ISO 12354-3 or DIN 4109-2. The acoustic quality of the facade can be assessed using various target values. The facade noise levels can either be freely defined in CadnaB or automatically transferred through interoperability with CadnaA. This allows verification of facade requirements according to DIN 4109-1 or, with ISO 12354, the calculation of interior noise levels. Additionally, individual requirements for sound insulation from outside to inside can be defined.

Building acoustics for an entire building

The building model in CadnaB extends the box-to-box principle (one source room, one receiving room) to larger, multi-storey structures. This means that sound transmission between neighboring rooms within an entire building can be taken into account and sound insulation against outdoor sound can be investigated in the same model—ideal for projects with many rooms and floors.

CadnaB offers numerous tools that enable an efficient analysis of an entire building or individual transmission situations. Thanks to automatic junction detection and requirements detection (according to DIN 4109-1 & DIN 4109-5), sound insulation requirements can be checked quickly and effortlessly. Despite the model's complexity, its representation remains clear, and adjustments can be made easily at any time.

Constructions can be efficiently assigned from CadnaB databases or from user-defined data. The most important transmission scenarios can be clearly summarized in the result table.