Maximum Span Calculator
for Wood Joists & Rafters
www.awc.org
Species
Size
Grade
Member Type
Deflection Limit
Spacing (in)
Exterior Exposure
Wet service conditions?

Incised lumber?
Live Load (psf)
Dead Load (psf)
















       
spancalcitunes The Span Calculator for Wood Joists and Rafters (Span Calc) is available for the iPhone.

The Maximum Horizontal Span is:
18 ft. 6 in.
with a minimum bearing length of 0.3 in.
required at each end of the member.
PropertyValue
SpeciesDouglas Fir-Larch
GradeNo. 1 & Btr
Size2x8
Modulus of Elasticity (E)1800000 psi
Bending Strength (Fb)2070 psi
Bearing Strength (Fcp)625 psi
Shear Strength (Fv)225 psi

While every effort has been made to insure the accuracy of the information presented, and special effort has been made to assure that the information reflects the state-of-the-art, neither the American Wood Council nor its members assume any responsibility for any particular design prepared from this Online Span Calculator. Those using this Online Span Calculator assume all liability from its use.

Comments? info@awc.org.