The layout of the common
a hip roof is the same as the layout for a gable roof. See "How To
Frame Gable Roofs". Mark the rafter plumb lines with a 150
unit of rise and 250 unit of run. Snap a chalkline at 1/3 of
depth to locate the seat cut of the birdsmouth. Accommodate
the ridge at the top end of
the rafter by measuring back 1/2 the thickness of the ridge (10 mm) at
90 degrees to the plumb line. Mark a new cutting line.
The end common
is adjusted to 1/2 the thickness of the common rafter measured at 90
degrees to the plumb line. See figure 3 bottom.
Layout the hip rafter by marking a 150/353.6 plumb line at the upper
end of the rafter.
See figure 3. Continue the plumb line square along the top edge of the
hip rafter and
mark the centre of the line as working point 1. Measure a
down the hip rafter equal to its line length and
establish working point 2. Measure a distance down the rafter
equal to the length of the overhang and mark the location of the plumb
and maintained by
images and text are copyright Ronald Hunter 2005 to 2011