Geluidsreductieindex

Geluidsreductie-index is a term used in building acoustics to quantify the ability of a construction element to reduce airborne sound transmission between spaces. It is a single-number rating, usually expressed in decibels (dB). The higher the value, the better the insulation.

The index is determined by standardized measurement procedures. In the laboratory, a sample of the element is placed between two rooms, a sound source is emitted on one side, and sound levels are measured on the other; the resulting difference yields the sound reduction index. In practice, the weighted sound reduction index, commonly noted as Rw, is the standard single-number quantity for walls and partitions. For doors, windows, and floors, variants or corrections (such as Rw+Ctr) may be used to reflect specific frequency performance. Both laboratory data and field measurements can be used, and flanking transmissions can affect real-world results.

Geluidsreductie-index is used in design, specification, and regulation to compare the acoustic performance of assemblies. It is influenced by material properties, thickness, joints, seals, and construction details. The index is one component of overall building acoustics and should be considered alongside other measures such as impact noise and reverberation time to assess interior comfort.

In summary, geluidsreductie-index provides a concise quantitative measure of how effectively a building element reduces airborne sound transmission, expressed in decibels, and is widely used in standards, guidelines, and construction practice.