Wall Length
Wall Width
Roof Angle
Overhang Sides
Overhang Gable
End Rafters In
Rafter Thickness
Rafter Depth
Ridge Thickness
Max Rafter Spacing

Birdsmouth Foot Cut
Bottom Plumb Cut
Extend Ridge  

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Set Bevel Gauge Angles

You need: 1 Ridge @ 44' × 1~1/2". 62 Rafters @ 12'10~1/2" × 8" × 1~1/2"

With a building length of 40' and width of 20', a roof overhang of 2' the roof is 44' long and 24' wide. With an angle of 22 °, the overall height above outer wall is 4'9~1/8"

The roof area is 1138.93 ft². Rafter spacing is 1'3~15/16" (Next larger spacing = 1'4~1/2" Next smaller = 1'3~7/16" )

139'9~1/4" lineal eave @ 2' overhang = 279.5 ft² level, or 293.4 ft² with side eaves = 22° )

Gable Area (under rafters ) = 40.4 ft²


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