Johnson Level & Tool Mfg. RAS-1 - Manual (Page 17)

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as you did in Step 1. You may wish to leave the tails long un-
til all the rafters are in place, so that you can mark the ends
to a line and then cut.
NOTE: The top and bottom cuts on the rake board are also
done in the same way as a common rafter but the distance
from the top cut to the bottom cut is the rake board length.
HIP AND VALLEY RAFTERS
The hip and valley rafters are treated very similarly because
both run at a 45° angle to the common rafter, and they
both form the diagonal or hypotenuse of a right triangle
(see Figure 8). The three sides being the hip, plate and
common rafter, or the valley, ridge and common rafter.
Therefore, the cuts and lengths apply equally to hip and
valley rafters.
FIG. 8 Top View Rafter Definition.
FIG. 7A
Seat Notch or
Bird’s Mouth Layout.