Gambrel Roof Rafter Layout

Purlins joints are used slopes are fixed and the length of the top and bottom rafters including overhang will always be equal.

Gambrel roof rafter layout.

This approach conforms to my general design philosophy when in comes to the structural design of houses. How to build perfect barn style gambrel roof trusses. Volume of building equal to gothic type building. Click here to see more shed building videos.

Check overhang to calculate rafter overhang equal to the lower level cut at the full rafter depth. Trace and cut osb or plywood joints to connect the rafter pieces. Place a 6 in 12 in 15 cm 30 cm rectangular piece of osb or 3 4 in 1 9 cm thick plywood under the joint of an assembled rafter. Move slider or directly enter angle to alter sweep angle of lower rafters and change the shape.

A regular gambrel fits inside a circumscribed semi circle and is essentially one half of a regular octagon. Design is flexible enough to fit your own design needs. Build the trusses now because the empty floor will be part of your temporary truss jig. Either use our standard design or we can custom build to your design.

This gambrel roof fits in a semicircle and starts as the top half of an equal sided octagon. Trace the top of the joint so the angle is at the same degrees as where the rafters connect. Then use a saw to cut the lines that you drew.