Wood species and grade
Southern pine No. 2
Douglas fir-larch No. 2
Hem-fir No. 2
Spruce-pine-fir No. 2
Western cedars No. 2
Joist size
2×6
2×8
2×10
2×12
Spacing
12 in on center
16 in on center
19.2 in on center
24 in on center
Live load
40 psf (code minimum for decks)
50 psf
60 psf
Incised lumber (small slits; usual on treated Douglas fir, hem-fir and SPF)
Your span to check (optional)
Deck joist span calculator ·
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