05-01-2017, 11:58 AM
Joist spacing is a function of span, joist size, and plywood rating.
Nominal size-spacing/span from some book I had laying around:
2x8 @ 16" = 13'
2x8 @ 24" = 10'
2x10 @ 16" = 16'
2x10 @ 24" = 14'
A mid-span girder might be cheaper than bigger/closer joists.
Subfloor can be thinner as the joists are closer together. I think the 1.125" subfloor can run over joists spaced at 48", but it's also something like $70/sheet.
Nominal size-spacing/span from some book I had laying around:
2x8 @ 16" = 13'
2x8 @ 24" = 10'
2x10 @ 16" = 16'
2x10 @ 24" = 14'
A mid-span girder might be cheaper than bigger/closer joists.
Subfloor can be thinner as the joists are closer together. I think the 1.125" subfloor can run over joists spaced at 48", but it's also something like $70/sheet.