Shed Roof Rafters Spacing

Use these two tables for roof rafters with a slope of 3 in 12 or less.

Shed roof rafters spacing.

A shed roof slopes in one direction only. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center. For standard shed roof rafter spacing see rafter span chart. Easy rafters is designed to calculate shed roofs that are framed to a ledger board nailed against a vertical wall not freestanding shed roofs supported by walls at both ends.

The same concept holds true for roof trusses. It is possible to calculate a birdsmouth near the top of the rafter for a freestanding shed roof by checking the kneewall checkbox and entering a setback for the kneewall that positions the upper birdsmouth in the desired location. This is most likely the standard size that you will find on pre made roof trusses. If you get premium kiln dried lumber then you could span 10 5 with the same size of lumber and rafter spacing.

So the space between rafters can be greater without reducing the maximum span. For example in the rafter span table below the highlighted cell in the 40 live load table indicates that 2 x 8 southern yellow pine joists that have a grade of 2 that are spaced 24 apart can have a maximum span of 10 feet 3 inches 10 3 if designing for a live load of 40 lbs ft 2. There is no standard spacing it depends on what size of rafters you want to use and the span of your shed. Typical standard the typical standard for the spacing on the roof trusses is 24 inches.

For instance 2 grade 2x4s at 16 on center will span just over 9.