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Wall Length Rafter Thickness
Wall Width Rafter Depth
Roof Angle Hip Thickness
Overhang (level) Hip Depth
Drop Hip Birds-mouth or Chamfer Hip to drop level with common rafters Ridge Thickness
Chamfer Hip Rafter Spacing
Bottom plumbcut Rafters and hips are longer for bottom plumb cut
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

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




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.

At an angle of 15 °, the overall height above outer wall is 907 mm
The ridge top is 901 mm above top of wall.
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 ° )

Roof Volume (top of wall/plate to under rafters) = 24.12 m³
Roof Volume (top of wall/plate to top of rafters) = 31.57 m³

You need: 1 Ridge @ 6050 × 50
20 Common Rafters @ 3728 × 100 × 50
4 Hips @ 5165 × 100 × 50
Creepers + 8 @ 2967 + 8 @ 2190 + 8 @ 1414 + 8 @ 637



Rafter Detail (new window)




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











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Bevel Gauge Page








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.

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+61 7 40987645

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If Plumb Cut = ?
If Seat Cut = ?


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