AWC Joist Span Calculator
Quick Answer: An AWC joist span calculation determines maximum allowable clear span distance for floor, ceiling, and deck joists based on American Wood Council (AWC) Maximum Span Tables and IRC Table R502.3.1.
Key Standard: For #2 Grade Spruce-Pine-Fir (SPF) 2×8 floor joists spaced 16″ o.c. under 40 psf live load and 10 psf dead load (L/360 deflection limit), the maximum allowable span is 10 ft 9 in (10.72 ft).
Key Standard: For #2 Grade Spruce-Pine-Fir (SPF) 2×8 floor joists spaced 16″ o.c. under 40 psf live load and 10 psf dead load (L/360 deflection limit), the maximum allowable span is 10 ft 9 in (10.72 ft).
Calculation Results
Required estimates based on your parameters:
Allowable Joist Span
10 ft 9 in
Bending Stress Limited
Bending Max Limit
10.72 ft
Bending threshold capacity
Deflection Max Limit
12.28 ft
Deflection cap L/360