These tables are based upon design values for visually graded . Footnotes: Used under dry conditions with lumber moisture content less than percent at time of installation. Spans shown are clear horizontal distance between supports. This tutorial module explains how to design with roof rafter span tables. This is Module Part 4: Roof Rafter, Joist and Beam Design of the Design Your Own .
Residential Building Code, R50 R802.
Span tables are used to size joists and rafters.
FLOOR JOIST SPANS FOR COMMON LUMBER SPECIES. BASE VALUES for dimension lumber computed with . Design values and span tables for Western Lumber along with supporting publications. The tables below give maximum spans for rafters and beams.
The figures are based on quality materials. For lesser grades, spans should be . Use the rafter snow load tables in areas of the country with ground snow loads. Roof rafter calculations are simple with our online rafter calculator that. Spans for rafters shall be in accordance with 7CMR Tables. GRADEаааааааааааааааааааааааTABLEаа1.
These span tables include spans for dimension lumber in the species hemlock, spruce, pine, fir for snow loads of to pounds per square foot. Dead Load (up to psf) Live Load: psf. Designed by CITIZEN INFORMATION CENTER. Ceiling Joist Span Chart —Attics Without Storage.
For other grades and species and for other loading conditions, refer to the . CONVENTIONAL LIGHT-FRAME CONSTRUCTION. About stronger than comparably sized dimension lumber , Longer spans or . Douglas Fir in horizontal roof rafters and maximum span.