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Wall Length Rafter Thickness
Wall Width Rafter Depth
Roof Angle Hip Thickness
Overhang (level) Hip Depth
Drop Hip Birds mouth hip to drop level with common rafters Ridge Thickness
Bottom plumbcut Rafters and hips are longer for bottom plumb cut Rafter Spacing
Setout Plan
Birdsmouth Seat Cut  Calculate Plumb and Seat cuts from roof angle
Battens Individual Batten Length
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 12000 mm and width of 6000 mm, a (level) roof overhang of 600 mm, the roof is 13200 mm long and 7200 mm wide. With an angle of 15 °, the overall height above outer wall is 907 mm. The roof area is 98.39 m² and sheathing angle is 45.99 °. Rafter spacing is 750 mm (Next larger spacing = 857.1 Next smaller = 666.7 ) Creeper shortening = 776.46 mm. 40.8 lineal metres Fascia. 40.8 lineal metres Eave @ 600 mm overhang = 24.5 m² Level ( or 25.3 m² at 15 ° )

You need: 1 Ridge @ 6050 × 50
20 Common Rafters @ 3701 × 100 × 50
4 Hips @ 5146 × 100 × 50
Creepers + 8 @ 2940 + 8 @ 2163 + 8 @ 1387 + 8 @ 610




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

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