Bit & GrainBit & Grain

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)

Spacing2x82x102x12
12″ o.c.14.5 ft17.9 ft21.4 ft
16″ o.c.12.6 ft15.6 ft18.8 ft
19.2″ o.c.11.4 ft14 ft17.1 ft
24″ o.c.10.3 ft12.8 ft15.7 ft

For reference only. Verify with your local building code and a licensed professional before making decisions.

Put your calculations to work.

Bit & Grain connects your estimates to job costing, invoicing, and scheduling. Free to start.