Check species as well as strength grade
Queensland adds a species rule to the timber framing routes in NCC 2022. For structural timber, the species must suit the scheduled use. A grade stamp alone does not answer that question. Check the species, intended use and design together.
What the Queensland clause says
QLD H1D6(4)(g) names Schedules A, B or C in Book 2. It names the December 2017 books. That check sits alongside the listed timber design routes.
This guide explains that NCC 2022 reference. Ask your certifier which code and state rules apply to your job. Do not assume that every edition uses the same book date.
Find the books and check the date
Business Queensland explains the two books:
| Resource | What to use it for |
|---|---|
| Book 1 | Definitions, timber properties, uses and decay hazard context |
| Book 2 | Properties, use schedules and conditions |
| Amendment record | Changes to read with the relevant book |
The official book collection lists January 2020 book files and a list of changes. The cited clause names December 2017. These dates differ. Keep both dates visible. Ask your certifier which text to use. Check this before you rely on a changed entry.
Business Queensland also describes QTimber, a tool for looking up timber uses and properties. Use the search to find the right entry. Keep the book and schedule reference with the plans.
Chippy Tools reference workflow. NCC 2022 QLD H1D6(4)(g) names December 2017 books; the current collection labels its book files January 2020.
Check the complete order line
Note the species, grade, treatment, use and member mark. Ask the supplier for the data to check each field. Find the species in the right schedule. Read its notes and limits too.
For example, an order lists only a trade name and grade. Ask the supplier to name the species or group. Ask for proof that it suits the planned use. A broad trade name may cover more than one species.
Keep species checks separate from sizing
A suitable species does not choose the member size or its joints. The framing design still sets the grade, section, supports and fixing details. Read the AS 1684 guide for those inputs and the MGP guide for grade marks.
Keep the schedule reference and supplier response with the order. Get any swap checked before the timber goes into the frame. The Chippy Tools code-check sheet has space for the clause, book date and questions to resolve.
Sources
Related building rules
More Australia rules