Changes To The Building Code Of Australia

For some time, it has been common knowledge that the previous requirements of the Building Code of Australia (BCA) for sound insulation (i.e. footfall) isolation performance had been considered inadequate. In May 2004, the BCA amended the minimum sound insulation requirements to reflect community expectations.

The “Deemed-to-Satisfy” provisions have introduced impact sound insulation requirements for floors. The terms to describe the impact sound insulation of the floor is the weighted normalized impact sound pressure level (L n,w ) plus the spectrum adaptation term (C i ) . The lower the L n,w + C i of the floor, the better the performance of the floor in terms of impact sound insulation.

The new BCA “Deemed–to-Satisfy” provisions require the L n,w + C i of a floor to be determined by testing in the laboratory. The impact sound insulation requirements for the floors are L n,w + C i not more than 62 for floors separating dwellings and for floors separating dwellings from a plant room, lift shaft, stairway, public corridor, public lobby or the like, or parts of a different classification.

Consequently, all of Damtec’s Impact sound insulation products have been independently tested in accordance with ISO 140 with results calculated in accordance with ISO 717.2 on ONLY a 140mm thick, concrete substrate with NO CEILING and the results have shown to surpass the requirements of the Building Code of Australia (BCA), Part 5 “ Sound Transmission and Insulation, Class 2 or 3 buildings – Floors.”