IRC Span Table Lookup
Look up maximum spans for floor joists, ceiling joists, and rafters from IRC span tables based on species, grade, size, and spacing.
IRC Table R502.3.1IRC Table R802.4IRC Table R802.5.1
Enter values and click Calculate
Look up maximum spans for floor joists, ceiling joists, and rafters from IRC span tables based on species, grade, size, and spacing.