The figures are based on quality materials.
Shed roof span tables.
There is no standard spacing it depends on what size of rafters you want to use and the span of your shed.
Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.
Span tables use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.
For lesser grades spans should be shorter.
Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.
For instance 2 grade 2x4s at 16 on center will span just over 9.
The tables below give maximum spans for rafters and beams.
Patio roof cover sheds water allows natural light.
Joist and rafter 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.
You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.
For standard shed roof rafter spacing see rafter span chart.
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.