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Wall Length Rafter Thickness
Wall Width Rafter Depth
Roof Angle Ridge Thickness
Overhang (level) Rafter Spacing
Overhang Gable
End Rafters Set-in
Extend Ridge Birdsmouth foot cut  Calculate Heel and Foot cuts from roof angle
Bottom Plumbcut Rafters are longer for bottom plumb cut Running Setout Points Include running measurements for ridge, wall and hip spacing
Battens Top Batten Set-in from top end of Rafter
NOT Ridge Centre
Batten Spacing Top Batten Set-in
Batten Width Bottom Batten Set-in











With a building length of 12000 mm and width of 6000 mm, a 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. Rafter spacing is 853.6 mm (Next larger spacing = 919.2 Next smaller = 796.7). 41.3 lineal metres eave @ 600 mm overhang = 24.8 m² level, ( or 25.3 m² with side eaves = 15 ° ). Gable Area (under rafters) = 2.41 m²

You need: 1 Ridge @ 13200 × 50
30 Rafters @ 3701 × 100 × 50



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





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