The deck construction guide for my area contains this table:
Look at the "Allowable Overhang" columns. It's odd that a wider joint spacing (24") permits a longer overhang.
For example, look at the row for 2x12 fir joists. At 12" O.C. spacing, overhang can be 4'4". At 24" spacing, this decreases to 3'3".
Now look at 2x8 fir joists. At 12" spacing, overhang can be 1'8". Increasing the spacing to 24" increases the allowable overhang to 2'2"!
This doesn't make sense: I'd think closer joist spacing means more load bearing capacity, allowing for longer overhangs. Even more confusing is there's no consistency between joist sizes. What gives?