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Question

When designing a timber framed home what are the cavity requirements, and where do I find this in AS1684? Also is the use of wool insulation now being discouraged because of the risk of condensation due to no airflow leading to timber rot?

Woodsolutions Answer +

As you are probably aware, condensation occurs when moisture-laden air meets a cold surface. It has become a concern in recent times, particularly in the colder parts of Australia, and NCC 2019 Building Code of Australia now includes a section on Condensation Management (Part F6), although directed to Class 2 and Class 4 buildings. AS 1684 does not address cavity issues since the Standard deals with all types of timber frames including those with no cavity (cladding on the external face, lining on the internal face).  It's not possible to deal with condensation management in detail here, but the Australian Building Codes Board (ABCB) has published a useful handbook available for download via this link https://www.abcb.gov.au/Resources/Publications/Education-Training/Condensation-in-Buildings

Condensation

Answered on 01-03-2021
Please note that our answer is based on the best advice available at the time. If the National Construction Code, Australian Standards or local requirements have been subsequently amended, our answer may no longer be correct in all details. For more information, please read our disclaimer.

Question

How do I find the minimum bolt edge distances for LVL and Glulam timber ? AS1720.1 Section 4.4.4.3 does not apply.

Woodsolutions Answer +

In our opinion the edge and end distances specified for timber members in Section 4.4.4 of AS 1720.1 also apply to glulam - refer clause 7.2 which states "Design of joints using glued-laminated timber shall be in accordance with the requirements of Section 4". Similarly for LVL, Section 8.5 refers back to Section 4 for the design of joints with "nails, screws, bolts and coach screws only". For other fasteners used with LVL the designer is referred to the manufacturer of the LVL or of the fastener.

Edge distance

Answered on 24-02-2021
Please note that our answer is based on the best advice available at the time. If the National Construction Code, Australian Standards or local requirements have been subsequently amended, our answer may no longer be correct in all details. For more information, please read our disclaimer.

Question

Firstly thank you for your resources and information, they are very informative and helpful. My company is the Australian distributor for Sherwin-Williams and we have a fire retardant clear coating system that has achieved a Euroclass classification of B s2 d0 in accordance with EN13501-1:2009 (LS Fire Testing Institute S.R.L Italy). I have found documentation from building.govt.nz where they publish an article called "Achieving NZBC Group Numbers for surface finishes from tests to overseas standards" and can distinguish what Group # our product system would achieve. see link https://www.building.govt.nz/building-code-compliance/c-protection-from-... . My question is how I am required to reference our evidence (compliance) in our technical data? I have an architect in Australia wanting to use this product but telling me the certificate/test report needs to reference "Clause C1.10 and Specification C1.10" however given this test was done in an European independent laboratory to the Euroclass system am i able to use an Anexure document from our company? Are you able advise what wording is required to ensure our documentation is compliant? I can provide our test certificate and technical data for your reference?

Woodsolutions Answer +

While we can answer most timber-related questions we don't claim any special expertise when it comes to building regulations. However, we can tell you that the Australian Building Codes Board (ABCB) has a handbook that gives guidance on applying the NCC's "evidence of suitability" provisions. The handbook should point you in the right direction and can be downloaded via this link https://www.abcb.gov.au/Resources/Publications/Education-Training/Evidence-of-Suitability.

National Construction Code

Answered on 17-02-2021
Please note that our answer is based on the best advice available at the time. If the National Construction Code, Australian Standards or local requirements have been subsequently amended, our answer may no longer be correct in all details. For more information, please read our disclaimer.

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