No. 150mm concrete walls (without electrical/water conduits or joints) provide Rw + Ctr = 47 dB. However, the Building Code of Australia accepts the above as a “deemed to satisfy” condition even though the minimum BCA requirement to comply is Rw + Ctr = 50 dB.
A 150mm concrete party wall with plasterboard cladding can no longer be treated under the “deemed to satisfy” conditions. Plasterboard attached to concrete faces with daub glue results in resonance in the plasterboard (i.e. drum effect) causing significant transmission loss. This eliminates the possibility of a 150mm concrete wall complying with the BCA.
BCA, Specification 5.2, Table 2 shows a 150mm concrete wall with plasterboard on 28mm furring channels which DOES NOT COMPLY. Daub glue provides up to 2mm to 4mm gaps between the wall and plasterboard surfaces in lieu of the 28mm gap of furring channels. Resonance of plasterboards increases when the gap between the wall and plasterboard gets smaller hence increases transmission loss. As a result, a 150mm concrete wall with daub glued plasterboard DOES NOT COMPLY WITH THE BCA.