Shed Roof Span Tables

Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run.

Shed roof span tables. Keep in mind that these are maximums in other words shortening spans slightly will result in a more solid structure. Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch. There is no standard spacing it depends on what size of rafters you want to use and the span of your shed. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.

Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. The figures are based on quality materials. For standard shed roof rafter spacing see rafter span chart. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.

For lesser grades spans should be shorter. Patio roof cover sheds water allows natural light. For instance 2 grade 2x4s at 16 on center will span just over 9. View joist rafter tables.

The tables below give maximum spans for rafters and beams.