Sample
Rafters
■
Chapter 6
63
plates of two walls. The lines formed where two gable roofs intersect are
also framed using valley rafters.
Figure 6-3
shows the plan view of an
L-shaped house, with the ridges, hip, and valley rafters marked. The rafters
shown as dashed lines are
hip jack rafters
(running between hip rafters and
the top of a wall plate), or
valley jack rafters
(running between valley
rafters and a ridge). All other rafters shown are considered to be common
rafters.
Notes
Copyright © 2007 by Calculated Industries, Inc.
and Thomson Delmar Learning
Construction Master® Pro Workbook and Study Guide
Ridge
Valley
Valley
Hip
Hip
Ridge
Figure 6-3 (Not to scale)
A
conventional
or
regular
roof contains common rafters having the
same pitch on both sides of the hip or valley;
irregular
roofs have different
pitches on either side of the hip or valley. In both cases, if the pitches joined
by a hip rafter are the same as the pitches joined by a valley rafter, then the
hip and valley rafters themselves are identical to each other in length,
plumb cut, and level cut.
One additional piece of information needed for hips and valleys is the
value of the
cheek angle.
This is the angle to which boards must be cut on
those surfaces which mate with the ridge/common rafters, and the corner
Warning
The roof framing
functions assume that
both ridges are
perpendicular to each
other and that the roof is
the same height
throughout.
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