Joist Span Lookup
Look up maximum floor joist span from IRC Table R502.3.1. Douglas Fir-Larch No. 2, 40 psf live load.
Max Span12.6ft
IRC Table R502.3.1 Reference (Doug Fir-Larch No. 2, 40 psf)
| Spacing | 2x8 | 2x10 | 2x12 |
|---|---|---|---|
| 12″ o.c. | 14.5 ft | 17.9 ft | 21.4 ft |
| 16″ o.c. | 12.6 ft | 15.6 ft | 18.8 ft |
| 19.2″ o.c. | 11.4 ft | 14 ft | 17.1 ft |
| 24″ o.c. | 10.3 ft | 12.8 ft | 15.7 ft |