SpanFinder.com.au
A focused guide to deck joist span tables, joist spacing and the common inputs used to compare joist products in Australian residential deck framing.
A joist span table checks the member that supports the decking boards and transfers load back to bearers, beams, walls or other supports. For decks, the searchable terms usually include deck joist span, joist spacing, floor joist span, single span and continuous span.
| Term | Meaning | Search wording |
|---|---|---|
| Joist spacing | Centre-to-centre distance between joists. | deck joist spacing, joist centres |
| Joist span | Distance between supports under the joist. | how far can deck joists span |
| Single span | One span between two supports. | single span joist table |
| Continuous span | Joist continues over an intermediate support. | continuous span joist table |
A deck joist span table shows how far a joist can span between supports for a stated joist size, material, spacing, load and span type.
It depends on the joist product, joist spacing, decking dead load, deck height, live load and whether the joist is single span or continuous span.
Deck joist spacing is the centre-to-centre distance between adjacent joists. Common search terms include 300 mm, 400 mm, 450 mm and 600 mm joist spacing.
Often yes, because each joist carries less tributary width, but the result must be checked in the published span table.
No. Joist tables and bearer tables check different structural roles and usually use different input columns.