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Using DEWALT RAFTER SQUARE (continued)
13) We must now consider the additional length that must be
added to the length of the rafter to accomodate the eave. We calculate
this by ratios. First, determine the length of common and hip/valley
rafters for this pitch roof. In our example, the rafter length is 12' 6". The
length of the hip rafter is 16' ". The ratio of hip rafter length to
common rafter length is:
16’
1
/8
"
1
/8
(16x12)+.125 192,125
= = =1.28
12’ 6” (12x12)+6 150
This ratio or the eave length at the hip or valley rafter divided by
the eave length at the common rafter.
D
=1.28 where D is the length of
C
the hip or valley eave, and C is the length of the common rafter eave,
as shown in the diagram below in our example:
D
=1.28, then D = 24”x l.28 = 30.72”
24”
COMMON RAFTER
HIP RAFTER
A
B
C
D
OVERHANG
C : EAVE LENGTH
D : HIP EAVE LENGTH
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