The 2012 Span Tables for Joists and Rafters updates the 2005 edition and provides a simplified system for determining allowable joist and rafter spans for typical loads encountered in one- and two-family dwellings and is referenced in the 2012 International Building Code.
A tutorial for using the span tables is also available.
A companion Supplement to Span Tables for Joists and Rafters, Design Values for Joists and Rafters tabulates allowable bending (Fb) and modulus of elasticity (E) design values for visually graded and mechanically graded dimension lumber.
This edition has been updated to the 2012 NDS Design Values Supplement. Changes include new design values for Coast Sitka Spruce and Yellow Cedar and updates to Northern Species design values.
Special notice about changes to southern pine design values.