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Actual Physical Sizes All measurements are actual physical finished sizes.

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 Calc Calculate Heel and Foot cuts + HAP from roof angle Ridge Thickness
Bottom Plumb-Cut Rafters and hips are longer for bottom plumb cut Ridge Depth
Drop Hip Birds-mouth or Chamfer to drop hip level with common rafters
Chamfer Hip Rafter Spacing
Setout Plan Include running measurement plan for ridge, wall and hip spacing

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

RunTalk Android App - Speaks Running Measurements while you mark them out! (free)




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)

At an angle of 22 °, the overall height above outer wall is 4'9~1/8"
The ridge top is 4'8~13/16" above top of wall.
Top of wall to under ridge is 3'10~13/16"
The roof area is 1138.93 ft² and sheathing angle is 47.16 °
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 ° )

Roof Volume (top of wall/plate to under rafters) = 1346.75 ft³
Roof Volume (top of wall/plate to top of rafters) = 1921.97 ft³
You need:
1 Ridge @ 20'1~1/2" × 1~1/2"
34 Common Rafters @ 13'1~23/32" × 8" × 1~1/2"
4 Hips @ 17'8~31/32" × 8" × 1~1/2"
Creepers (Jacks)
8 @ 11'8~15/16"
8 @ 10'3~11/16"
8 @ 8'10~7/16"
8 @ 7'5~3/16"
8 @ 5'11~15/16"
8 @ 4'6~21/32"
8 @ 3'1~13/32"
8 @ 1'8~5/32"
Ply Sheathing Angle and Cut Set-back







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


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











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Free Android Apps
Pitch ~ Angle Measure + Convert
Square Lay-out
8" Block Vertical Rebar Placement
Running Measurement Layout

RunTalk Android App

Speaks Running Measurements while you mark them out.

Contact me - Greg Tarrant - Blocklayer.com Builders + Tradies Calculators

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Greg Tarrant
ph: Australia
+61 7 40987645

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Blocklayer.com Construction Calculators

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If Seat Cut = ?


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