Maximum Span Calculator for Joists & Rafters

Species
Size
Grade
Member Type
Deflection Limit
Spacing (in)
Exterior Exposure
Wet service conditions?

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



       


The Span Calculator was designed and created by Cameron Knudson and David Pollock at Washington State University. Support for development of the Span Calculator was provided by AF&PA's American Wood Council