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Wall Length Rafter Thickness
Wall Width Rafter Depth
Roof Angle Enter angle in degrees directly or select pitch from dropdowns to calculate and enter angle °= in 12 Hip Thickness
Overhang (level) Hip Depth
Birdsmouth Seat Cut Rafters and hips birdsmouthed Ridge Thickness
Calculate Heel and Foot cuts + HAP from roof angle Calc Birdsmouth + HAP * Rafter Spacing
Drop Hip Birds mouth hip to drop level with common rafters
Setout Plan Include running measurement plan for ridge, wall and hip spacing Bottom PlumbCut Rafters and hips are longer for bottom plumb cut
Battens Individual Batten Lengths
Batten Spacing Top Batten Set-in from top end of Rafter NOT Ridge Centre Top Batten Set-in
Batten Width Bottom Batten Set-in








With a building length of 40' and width of 20' , a (level) roof overhang of 2' , the roof is 44' long and 24' wide (136' Fascia). With an angle of 22 °, the overall height above outer wall is 4'9~1/8" . The roof area is 1138.93 ft² and sheathing angle is 47.2 °. Rafter spacing is 1'4" (Next larger spacing = 1'5~5/32" Next smaller = 1'3" ). Creeper (Jack) shortening = 1'5~1/4". 136' lineal eave @ 2' overhang = 272 ft² Level ( or 293.4 ft² at 22 ° )

1 Ridge @ 20'1~1/2" × 1~1/2"
34 Common Rafters @ 12'10~1/2" × 8" × 1~1/2"
4 Hips @ 17'6~11/16" × 8" × 1~1/2"
Creepers (Jacks) + 8 @ 11'5~23/32" + 8 @ 10'15/32" + 8 @ 8'7~7/32" + 8 @ 7'1~15/16" + 8 @ 5'8~11/16" + 8 @ 4'3~7/16" + 8 @ 2'10~3/16" + 8 @ 1'4~29/32"






Check box for bottom plumb cut Check box (top) for bottom plumb cut


Hip end cuts + member layout Hip end cuts + member layout as below

Hip roof member joints

* Hip rafter length to points formed by side cuts

To see how rafter plumb and side cuts are made, print paper templates, fold over wood and cut through.








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If Plumb Cut = ?
If Seat Cut = ?

Birdsmouth