Use pressure treated lumber when you install the joists.
Treated pine deck joists.
The images provided show our home prior to and after i fitted this deck.
It has a much higher resistance to moisture than ordinary lumber even more than rot resistant types like redwood and cedar.
The table includes spans for.
The sub floor joists and bearers are treated pine.
We do use 400mm spacings with clear treated pine as it is slightly more flexible than our other decking materials.
Please see an example of 450mm joist spacing below with your joist spacing determined you can use the 450mm column to determine what size timber you will need for your joists.
Until a few years ago the irc didn t have deck joist span tables.
In typical deck construction with a ledger on one side of the joist and beam on the other the size of the joists is driven by the size of the deck and based on the general maximum spans mentioned above.
The decking is 90 mm wide and 22 mm deep.
All materials were new from bunnings nerang.
Decks get wet and may be framed with incised treated lumber so spans may have to be adjusted.
For best results refer to our wood and composite deck joist span table.
But the 2015 irc included a new one table r507 5 that will make it easy for deck builders to spec a joist size for a given span and joist spacing.