“Bastard” Hip & Valley Rafters
— (Irregular Non-45 Degree)
You’re working with a 7-in-12 Pitch and half
your overall span is 15 feet 7 inches. The Pitch of
the irregular side is 8-in-12: (A) Find the point-
to-point length for the common rafter and (B)
Find the length of the adjoining “irregular” hip
(or valley).
Irregular
hip
Plate
Plate
Plate
Irregular
hip
COMMENTS KEYSTROKES
Clear calculator [On/C] [On/C]
Step 1 — Find Common Rafter Length
Enter Run of common 15 [Feet]
rafter 7 [Inch] [Run]
Enter roof Pitch 7 [Inch] [Pitch]
Find common rafter [Diag]
Answer: 18 FT 0-31/64 IN
Step 2 — Find Irregular Hip Rafter Length
Enter “Irreg.” Pitch* 8 [Inch] [Hip/V]
* As noted previously, while entering 8 [Inch] [Hip/V] is the
same as entering [.] 667 [Hip/V], entering 8 [Hip/V] without
dimensions will give you the equivalent of 96 inches of
Pitch, and you should therefore use caution when using non-
dimensioned Pitch values.
User’s Guide — 43
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