Question 1

What size Hardwood deck joist do I need?

Accepted Answer

Hardwood deck joists are typically supplied in 90×45, 120×45, 140×45, 190×45 and 240×45 mm sections. The correct size for your project depends on the span, spacing and load condition — always confirm against the AS 1684.2 deck joist table for your wind classification.

Question 2

What spacing should I use for Hardwood deck joists?

Accepted Answer

Deck Joists are typically installed at 450 or 600 mm centres in Australian residential construction. Wider centres mean larger sections; narrower centres allow smaller sections or longer spans for the same section.

Question 3

Is Hardwood suitable for deck joists under AS 1684?

Accepted Answer

Yes — Australian Hardwood is recognised under AS 1684 for deck joists in residential construction. Wind classification, load condition and span all affect the specific section size needed; always size against the official AS 1684.2 (non-cyclonic) or AS 1684.3 (cyclonic) table.

Hardwood deck joists span tables (Australia)