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Laying
Out And Cutting Rafter Birdsmouths At Each Rafter End
The
rafter birdsmouth at WP1 is laid out first. See figure 2. Slide the
Frederickson
Metric Framing Square down the
rafter until the bottom edge of the rafter intersects the exterior 50
mm mark on
the tongue of the square, and intersects the exterior 250 mm
mark on the
blade at WP1. Mark the seat cut line from WP1 along the bottom
edge of the blade for a distance of 89 mm. 89 mm is the width of the
top plate. At the 89th mm mark draw a plumb line and lay out the
birdsmouth.
Slide the square down the rafter to layout the seat cut of the
birdsmouth at WP2. Use the same rise and run units, and rafter and
metric square edges as WP1. Position
the blade's 250 mm mark along the bottom edge of the
rafter so the length along the bottom edge of the blade, from the 250
mm mark to the plumb line at WP2, is 89 mm. Layout the birdsmouth.
See "How to Frame Gable Roofs" for instructions on how
to layout a birdsmouth.
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