Question 1

What size F17 floor joist do I need?

Accepted Answer

F17 floor joists are typically supplied in 140×45, 190×45, 240×45, 240×63 and 240×90 mm sections. The correct size for your project depends on the span, spacing and load condition — always confirm against the AS 1684.2 floor joist table for your wind classification.

Question 2

What spacing should I use for F17 floor joists?

Accepted Answer

Floor 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 floor joists under AS 1684?

Accepted Answer

Yes — F17 Hardwood is recognised under AS 1684 for floor 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 floor joists span tables (Australia)