Calculated Industries 3088 - Manual (Page 43)

“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).
Common Common
15’ 7”
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]
Answer: 22 FT 7-3/8 IN
* 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