Question 1

What size F17 ceiling joist do I need?

Accepted Answer

F17 ceiling 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 ceiling joist table for your wind classification.

Question 2

What spacing should I use for F17 ceiling joists?

Accepted Answer

Ceiling 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 F17 suitable for ceiling joists under AS 1684?

Accepted Answer

Yes — F17 Hardwood is recognised under AS 1684 for ceiling 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.

F17 ceiling joists span tables (Australia)