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Gambrel Roof Framing Geometry Calculator - Inch

This Gambrel Roof fits in a semicircle, and starts as the top half of an equal sided octagon. Move slider or directly enter angle to alter sweep angle of lower rafters and change the shape.
Check Overhang to calculate rafter overhang equal to the lower level cut at the full rafter depth. With overhang selected, drag slider to increment - decrement birdsmouth seat width to suit. Geometric calculator only Geometric calculator only. Check local building regulations for sizes, spans angles etc.

Wall Width
Roof Length
Sweep Angle
Rafter Depth Actual
Ridge Thick Actual
Purlin Thick Actual
Seat
Base
Check the Gussets box and enter Gusset Base width to create dimension diagrams.

Direct Measure Left click, release and drag in main diagram to directly measure dimensions..

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Sweep° Scale

Gambrel roof framing calculator plan diagram with full dimensions and angles

Gambrel roof lower rafter detail diagram
Gambrel roof upper rafter detail diagram





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Don't cut it, or cut it wet so there's NO DUST - Silicosis Sucks
And if you're cutting wet, wear a mask - theres dust in the spray mist too!

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Check relevant local regulations for appropriate sizes, spacings and all engineering requirements.


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