NCC 2022 Volume One - Building Code of Australia Class 2 to 9 buildings
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29

Specification 29 Impact sound – test of equivalence

Specification 29 Impact sound – test of equivalence

NCC Blurbs

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

NCC Title
Scope
NCC State
NT
NCC Variation Type
Replacement
NCC SPTC Current
Scope

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

 

Specification 29 contains details of the test procedure to determine how a proposed wall system resists the transmission of impact sound, in comparison to a system specified in S28C4 to S28C7 of Specification 28.

NCC Blurbs

(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.

NCC Title
Construction to be tested
NCC State
NT
NCC Variation Type
Replacement
NCC SPTC Current
Construction to be tested

(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 S28C4 to S28C7.

(2) The testing of a construction specified in S28C4 to S28C7 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.

S29C2 outlines the construction to be tested, and only requires that the Table 2 of Specification 29 system being used as a test comparison is tested once, so long as certain specified conditions are followed.

 

NCC Blurbs

(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.

NCC Title
Method
NCC State
NT
NCC Variation Type
Replacement
NCC SPTC Current
Method

(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 10 m2.

 

S29C3 outlines the precise method to determine how a proposed wall system resists the transmission of impact sound, in comparison to a system included in S28C4 to S28C7 of Specification 28. Several referenced documents are used as the basis of the testing procedure.