Acoustic performance

With careful design it is possible to obtain a timber structural unit with excellent sound insulation properties.

Information on the performance of noise control systems in New Zealand is provided in proprietary manufacturers’ literature.

Designers should ensure that technical information in such literature is current and based on testing in accordance with the required standards.

Site test results are sometimes offered as evidence of previous acoustic performance. Building type, location and size of rooms are all important factors that influence the achievement of good acoustic performance.

It is useful to remember, however, that a positive result under one set of conditions does not always mean a similar result will be achieved under different design parameters.

Specific project requirements may require the use of an acoustic engineer to obtain the best results.

New Zealand gypsum plasterboard manufacturer Winstone Wallboards Ltd provides a range of tested inter-tenancy noise control wall, floor and ceiling systems with sound transmission class (STC) and impact insulation class (IIC) ratings of 55 or more, and lower performance systems for discretionary use.

The GIB® Noise Control literature also provides construction details for timber framed buildings.

Source: Timber Design Guide, 2007

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