Before choosing a floor covering
Step 1: Check the building's base acoustic performance
The LnT,w value (impact sound level) of the building depends on its construction. Note: Every multi-level building is unique, consider the;
- Concrete slab thickness – Typically ranges from 150 mm to 220 mm in Australia but can be thicker
- Insulation – Type and thickness of insulation, if used
- Plasterboard – Thickness, if present; some modern buildings may not include it
- Ceiling space – The gap between the ceiling and concrete slab, which varies by building
Step 2: Determine acoustic rating goal/requirements
E.g. The NCC regulation for impact noise in new buildings class 2,3 and 9c, floors must achieve a weighted standardised impact sound pressure level L’nT,w of 62 dB or lower derived from field tests (ISO 717-2), for assessing impact sound isolation in multi-dwelling buildings.
When it comes to general refurbishments that are not regulated by the National Construction Code (NCC), body corporate organisations usually oversee the process. Each body corporate has the power to set its standards for acoustic performance in these refurbishments. However, some may choose to follow the guidelines provided by the Association of Australian Acoustical Consultants (AAAC).
Step 3: Choose the right flooring solution
This is where acoustic flooring or underlay solutions come in. Look for products specifically tested to provide the required.
Scenario example: A building base acoustic performance achieves an L’nT,w of 62, and wants to achieve an AAAC 5-star rating, the acoustic rating must reach an L’nT,w of 45 dB or lower. This means to achieve a 5 star AAAC rating you’ll need to reduce the L’nT,w impact noise by at least 17 dB.
