Deck Joist Span — 16 Inch On Center
Sixteen inches on center is the default layout for many wood and composite decks. Here is every Table 2 span and overhang at that spacing.
All species at 16″ o.c.
When to choose 16″ o.c.
Use 16″ when decking allows it and you want a balance of lumber count versus span. Drop to 12″ if decking requires it or you need a longer joist span without upsizing. Jump to 24″ only when both the joist table and the decking product allow it—many composites do not.
Back to the full deck joist span tool, or read decking vs joist span.