Figure 2-44.-Shortening allowance of valley rafters suspended
ridge method of intersecting roof framing.
Figure 2-45.Method of framing dormer without sidewalk.
Figure 2-46.Arrangement and names of framing members
for dormer without sidewalls.
Figure 2-47.Valley rafter shortening allowance for dormer
As indicated in figure 2-44, the shortening
allowance of each of the short valley rafters is one-half
the 45° thickness of the addition ridge. Each rafter is
framed to the addition ridge with a single side cut.
Figure 2-45 shows a method of framing a gable
dormer without sidewalls. The dormer ridge is framed
to a header set between a pair of doubled main-roof com-
mon rafters. The valley rafters (AB and AC) are framed
between this header and a lower header. As indicated in
the framing diagram, the total run of a valley rafter is
the hypotenuse of a right triangle with the shorter sides
equal to the total run of a common rafter in the dormer.
Figure 2-46 shows the arrangement and names of
framing members in this type of dormer framing.
The upper edges of the header must be beveled to
the cut of the main roof. Figure 2-47 shows that in this