Specification 29 Impact sound – test of equivalence

NCC 2022 Volume One - Building Code of Australia Class 2 to 9 buildings

NT S29C1 ScopeNew for 2022

Delete clause S29C1 and insert NT S29C1 as follows:

This Specification describes a method of test to determine the comparative resistance of walls to the transmission of impact sound.

NT S29C2 Construction to be tested2019: NT Spec F5.5: 2

Delete clause S29C2 and insert NT S29C2 as follows:

(1) The test is conducted on a specimen of prototype wall construction and on a specimen of one or other of the constructions specified in NT S28C3.

(2) The testing of construction specified in NT S28C3 need not be repeated for subsequent comparisons provided complete records of the results, the test equipment and the technique of testing are kept so that identical equipment can be employed and an identical technique can be adopted in the testing of specimens of prototype wall construction.

NT S29C3 Method2019: Spec F5.5: 3

Delete clause S29C3 and insert NT S29C3 as follows:

(1) The wall constructions to be compared must be tested in accordance with AS 1191.

(2) A horizontal steel platform 510 mm x 460 mm x 10 mm thick must be placed with one long edge in continuous and direct contact with the wall to be tested on the side of the wall on which the impact sound is to be generated.

(3) A tapping machine complying with ISO 140/6 — 1998 (E) must be mounted centrally on the steel platform.

(4) The sound transmission through the wall must be determined in accordance with AS 1191 except that the tapping machine as mounted on the steel platform must be used as the source of sound.

(5) The impact sound pressure levels measured in the receiving room must be converted into normalised levels using a reference equivalent absorption area of 10m².