2×8 SPF Floor Joist Span (16" O.C., 40 PSF)
SPF lumber is common in northern states and Canada. More economical than Douglas Fir but with lower strength values, requiring closer attention to span limits.
Results
Maximum Span12'-0"
Maximum Span144inches
Species & GradeSpruce-Pine-Fir #2
Load ConditionLive Load: 40 psf, Dead Load: 10 psf
Deflection LimitLive Load: L/360, Total Load: L/240
Code ReferenceIRC Table R502.3.1
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