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Wall Length
Rafter Thickness
Wall Width
Rafter Depth
Roof Angle
Ridge Thickness
Overhang (level)
Rafter Spacing
Overhang Gable
Adjust Equal Spacing
Exact spacing
End Rafters Set-in
Extend Ridge
Birdsmouth Seat
Bottom Plumbcut
Running Setout Points
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
Adjust Equal Batten Spacing
Exact Batten Spacing
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.
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
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
Roof Volume (top of wall/plate to under rafters) =
28.94
m³
Roof Volume (top of wall/plate to top of rafters) =
36.39
m³
You need: 1 Ridge @
13200 × 50
30 Rafters @
3701 × 100 × 50
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Greg Tarrant
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