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Question

We design timber members to suit structural loads using AS/NZS1720.1. We have some laminated finger jointed timber of a specific species that we would like to use, and want to get it tested to measure the structural design properties used by AS/NZS1720.1 to determine the design capacities of elements and joints. Could you please advise us of the requirements and regulatory documents (eg. Standards) we must follow to achieve this?

Woodsolutions Answer +

We understand that Dr Constantine ('Con') Adam is the Director of the Glued Laminated Timber Association of Australia (GLTAA) Inspectorate. Dr Adam would be able to advise you on the required test protocols. You will find his contact details via this link https://gltaa.com.au/members/university-of-melbourne.

Glulam accreditation

Answered on 15-04-2021
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

We are building a deck 3m (wide) x 11m (long) & over 1m (high). What are the recommended post footings spans for the subframe, and the bearer and post sizes?

Woodsolutions Answer +

Our Technical Design Guide #21 titled Domestic Timber Deck Design provides a comprehensive guide to deck construction. It can be downloaded free of charge via this linki https://www.woodsolutions.com.au/publications. For timber sizes, the Guide refers to Australian Standard 1684. If you don't have access to AS 1684, timber sizes can be obtained from Timber Queensland's Technical Data Sheet 4 which is available via this link http://www.ozbuildmaterials.com.au/pdf/TQL%2004%20Residential%20Timber%20Decks0306.pdf.

Deck construction

Answered on 13-04-2021
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

I am wondering what the requirements are for jack studs to support the end of windowsill trimmers. It appears to be common industry practice to provide these, but I can't find anything in AS 1684 that specifies this. 

Woodsolutions Answer +

Windowsill trimmers are shown in Figure 6.17 of AS 1684.2, and clause 6.3.6.6 specifies their required size. Windowsill trimmers are supported along their length by jack studs at the same spacing as the common studs, but there is no requirement to provide jack studs each end, and none of the diagrams in AS 1684.2 show this practice. Of course if double or triple jamb studs are installed before the windowsill trimmers are fixed in place it might not be possible to nail through the studs, into the ends of the trimmers, in which case jack studs each end would be an alternative way of providing support. 

Windowsill trimmers

Answered on 18-03-2021
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.

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