White Paper: Kij on-site measurements

Elastic interlayers for reduced flanking transmission in CLT constructions: in-situ measurement campaign

The overall sound transmission between rooms depends on multiple transmission paths: direct, indirect and flanking transmission.
In the flanking sound paths, vibrational energy is transmitted from one building element (e.g. a floor or a wall) to another via their common junction.
When speaking about mass timber, it is common to have a wish to keep the wood exposed and this together with the lack of mass of this type of construction increases the importance of flaking transmission paths.
The total vibration reduction index, Kij, can be calculated using norm ISO 12354-1 and expresses the attenuation of the vibrational power flow through a junction, playing a key role in transmission.

The last version of norm ISO 12354-1 introduces in Annex F some methods to determine, within clearly defined limitations, Kij values for T and X junctions in CLT. However, these formulas are only applicable to rigid connections where metal connectors or elastic decoupling materials are not being used. Significant differences have been noticed by CDM Stravitec, between the calculations based on the norm versus measured Kij values in situ.

Get Your Copy Now!

Fill the form below and get the 'Elastic interlayers for reduced flanking transmission in CLT constructions: in-situ measurement campaign' white paper delivered straight to your inbox.