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Deck Joist Span Chart (planning)
| Size | 24″ o.c. | 16″ o.c. | 12″ o.c. |
|---|---|---|---|
| 2×6 | ≈ 8.0′ | ≈ 9.5′ | ≈ 10.5′ |
| 2×8 | ≈ 10.0′ | ≈ 12.0′ | ≈ 13.5′ |
| 2×10 | ≈ 12.5′ | ≈ 15.0′ | ≈ 16.5′ |
| 2×12 | ≈ 15.0′ | ≈ 18.0′ | ≈ 19.5′ |
Estimate the maximum clear span by joist size and spacing. Planning only — confirm with official span tables and your inspector.
| Size | 24″ o.c. | 16″ o.c. | 12″ o.c. |
|---|---|---|---|
| 2×6 | ≈ 8.0′ | ≈ 9.5′ | ≈ 10.5′ |
| 2×8 | ≈ 10.0′ | ≈ 12.0′ | ≈ 13.5′ |
| 2×10 | ≈ 12.5′ | ≈ 15.0′ | ≈ 16.5′ |
| 2×12 | ≈ 15.0′ | ≈ 18.0′ | ≈ 19.5′ |