Amendments & updates
Australian Standards AS 1684.2-2010 Residential timber-framed construction – Non-cyclonic areas and AS 1684.3-2010 Residential timber-framed construction – Cyclonic areas were amended on 21 June 2012.
The standards are an important reference document to assist with the construction of timber-framed class 1 and class 10 buildings to accommodate the various wind classifications that apply throughout Queensland.
The June 2012 amendments contain:
- A correction that applies to figure 6.9(e) being a lintel directly below a top plate for both cyclonic and non-cyclonic regions. This correction should be inserted into both standards at the appropriate place
- Changes to the CD supplements that contain tables of maximum span in the various structural applications for a range of commonly supplied timber sections in various wind classifications. The amended supplements for both standards should be read in conjunction with the relevant CD
- A complete revision of the AS 1684.3 (cyclonic areas) C3 Supplement 4 and tables 1 through to 53
- General housekeeping for typos throughout the supplements.
The following amendments apply to AS 1684.2-2010 Residential timber-framed construction – Non-cyclonic areas as of 21 June 2012:
- N1/N2 Supp 4; Supp 5; Supp 6
- N3 Supp 4; Supp 5; Supp 6
- N4 Supp 4; Supp 5; Supp 6
Download the amendments to AS 1684.2 in a single PDF document. Remember, you must log in to the website using your Master Builders member number and password to access the document.
The following amendments apply to AS 1684.3-2010 Residential timber-framed construction – Cyclonic areas of 21 June 2012:
- C1 Supp 4; Supp 5; Supp 6
- C2 Supp 4; Supp 5; Supp 6
- C3 Supp 4 – including tables 1 to 53; Supp 5; Supp 6
Download the amendments to AS 1684.3 in a single PDF document. Remember, you must log in to the website using your Master Builders member number and password to access the document.
From 1 May 2013, the Building Code of Australia (volumes 1 and 2) will reference the revised Australian Standard AS/NZS 4505-2012 Garage doors and other large access doors.
A review of the structural damage, which occurred as a consequence of Cyclone Yasi, indicated that garage doors and large access doors were a common point of failure. For this reason the standard was revised and updated to improve building resilience.
The objective of the standard is to provide specifications covering the construction and performance criteria of large access doors, including garage doors. It addresses minimum performance requirements for structural loads as well as manufacturing and installation issues.
Volumes 1 and 2 of the Building Code prescribe that the manufacture and installation of garage and large access doors shall comply with the standard when they are located within wind regions C or D.
Wind region C applies to Queensland and commences at Bundaberg, extending north along the Queensland coast line.
Generally the requirement reads as:
Volume 1, Section B1.4
The garage doors and other large access doors in openings, not more than three metres in height, in external walls of buildings determined as being located in wind region C or D in accordance with AS/NZS 1170.2: AS/NZS 4505.
Volume 2, Section 3.11.6 (j)
The garage doors and other large access doors in openings, not more than three metres in height, in external walls of buildings determined as being located in wind region C or D in accordance with Figure 220.127.116.11 & AS/NZS 4505 Garage doors and other large access doors.
Effect of changes
The changes to the standard will cause an increase in costs for the manufacture and installation of these doors.
Upon that basis, contractors are advised to check their costings before committing to a contract to perform building work, which includes the supply and installation of garage or large access doors.
It is recommended that contractors always seek clarification from a building designer and/or building certifier to determine the wind region for the proposed building works before providing a quotation for the project.
Contract variations & building approvals
For those contractors who had a written contract in place and detailed plans prior to 1 May 2013, and were yet to lodge a development application, the following two options may be applicable:
Option one – Variation required by law
The consequential costings for the installation of a garage door to comply with the newly referenced standard is a new statutory requirement for which a contractor could not have reasonably anticipated an increase in cost.
In the Master Builders Residential Building Contract, clause 13 of the general conditions provides for variations required by law. The new requirement for the installation of garage doors in cyclonic regions falls into this category.
Therefore, contractors should give the owner a written variation detailing the additional cost brought about by this change to the garage door requirements.
Option two – Building certifier building assessment provisions
Section 37 of the Building Act 1975 (the Act) may allow the prior technical requirements of the building code to apply under certain conditions for a building application made after the adoption date of a new technical requirement.
This means the building certifier may consider and utilise the following points, as stated in section 37 of the Act:
- Planning for carrying out the work started before a building assessment provision is amended and the building certifier for the building development approval certifies in writing that:
- Substantial progress was made on the design of the building, or the design was completed, before the amendment
- The design would need to be changed to comply with the amended provision
- The changes needed under subparagraph (ii) are not minor changes, having regard to the amendment and the nature of the building work.
Therefore, contractors who have entered into a written contract with substantially progressed plans prior to 1 May 2013 may request the certifier to utilise the provisions of section 37.
What this means is that section 37 allows a certifier to accept a garage door that is not compliant with the latest requirements. Nevertheless it will be essential that a contractor demonstrates to the certifier that the design had been substantially progressed prior to 1 May 2013.
Need more information?
Please have your Master Builders membership number handy when you call.