Shed Roof Rafter Design

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.

Shed roof rafter design.

See rafter run to outer wall calculator below. Measure your rafter boards for your preferred roof style and pitch. 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. The roof on this shed is a 4 in 12 slope which makes it a 18 and one half degree angle on the board ends.

By tying the rafters across at eaves level you stop the deadly eaves spread mentioned in method 1. A shed roof slopes in one direction only. An alternative method of roof framing using purlins and roof trusses. A simple gable shed roof is often built using 2 4 or 2 6 lumber for the rafters and 2 4 for the collar ties.

Print full scale rafter cut templates and birdsmouth templates fold template over rafter to mark or cut through. Now you have extra 2 4 hanging over the bottom chord. House with a shed roof an economical alternative to a traditional gabled roof ten years ago the shed roof was more common on actual garden sheds and garages not homes. Then cut the rafter angle at 30 degrees for two 2 4 s.

Trussed rafters this method of gable shed roof design makes each set of rafters into a lightweight truss. So roughly 7 8 long for a 2 4. This will allow them to join and form the peak of the roof and let the other end fit nicely at the 60 degree angle of the bottom chord. Half building width minus 1 2 ridge thickness.

However architects have recognized the potential of this form of design and now the shed roof is becoming a common feature among modern homes. The exact length and angle of your rafters will depend on the overall size of your shed as well as the style and slope you ve chosen. 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. A gable roof for a shed can be built with rafters with a 1 6 ridge board or using trusses.

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. Allow for ridge thickness when determining rafter run to outer wall. Much depends on the structure size and the desired attic loft or headroom. The rule of thumb is that the gusset should be twice the width of the wood you use for your rafters.

The ridge end of the rafter and often the eve end will need to be cut to the angle of the roof slope. A rafter or speed square will have marks for both of these angles. For an 8 10 shed one sheet of plywood should be fine.