As Built Learning Exchange

Airport Noise in the Vicinity of Perth Airport (Framed Wall) Local Practice Solution

Published: 06 May 2009 / Amendment 7 / Statement of Planning Policy 5.1 - 2004

This Common Practice Solution describes work outside the scope of the Building Code of Australia Volume 2 (BCA) and therefore DOES NOT verify BCA compliance.

How is DTC Specification Equivalence Achieved?

Statement of Planning Policy 5.1 – Land Use Planning in the Vicinity of Perth Airport references the Aircraft Noise Insulation for Residential Development in the Vicinity of the Perth Airport – Final Report February 2004.

Table 6 in Section 4 of the Report nominates STC/Rw Ratings for building elements in a range of noise attenuation (construction) packages. Section 6 includes Packages 1-to-4 in the Deemed-to-Comply Specification (DTC) that applies to Class 1 Buildings in areas above the 25 ANEF aircraft noise exposure contour.

Package 1 (Base Level Construction) includes a requirement for walls (double masonry with cavity) to achieve an STC/Rw Rating of 50. Expert evidence is provided to verify that framed wall construction achieves an STC/Rw Rating of 50 and therefore meets the performance required of DTC Specification construction.

Note: The DTC Specification includes a range of additional construction requirements. A survey of current industry and regulator practice suggests that, of these addition requirements, the specification provided for ceiling and roof construction is not sufficient to provide a common understanding of what is required. Both affect construction affordability and performance, bit there is insufficient information in the report to verify potential equivalent to DTC Specification construction options that may enable industry to achieve a better compliance outcome.

What Evidence is Provided To Verify DTC Equivalence?

The DTC Specification equivalent construction for framed wall construction is:

  • Studwork – 92mm steel frame.
  • External cladding – 2 layers of 6mm fibre cement sheeting (or 1 layer of 6mm fibre cement sheeting and 1 layer of 13mm fire-rated plasterboard).
  • Internal cladding – 2 layers of 13mm fire-rated plasterboard or 1 layer of 13mm fire-rated plasterboard and 1 layer of 6mm fibre cement sheeting.
  • Insulation – 75mm fibreglass insulation at 14 kg/m3 density (or Tontine).
  • Construction – as per BCA (Volume 2) Part 3.8.6 Acceptable Construction Practice described in sub clause 3.8.6.3 (d) – General installation requirements for walls. 

Click the link below for the full text which includes the conditions of use and expert evidence.

Building Professional Registration or Login Required

To download the file aircraftnoise-framedextwall-lps-amendment-7.pdf you need to login to the As-Built Learning Exchange. If you are a Building Professional and you do not have login access, you will need to register.