POCKET REFERENCE GUIDE — 30
Regular Hip/Valley and Jacks
A roof’s pitch is 9/12 and half the total
span is 6 feet. Find the lengths of the
Common, Hip/Valley and Jack rafters.
Also find the cut angles:
Note: Jack rafters are set at 16” on-center spac-
ing; to change on-center, use
j
— e.g., for a
17” o.c., enter
1 7 j
.
KEYSTROKE DISPLAY
o o 0.
1. Find the Common rafter length:
6 f R X 6 FEET 0 INCH
9 i p PTCH 9 INCH
d
(Common)
R 7 FEET 6 INCH
2. Find the Hip/Valley rafter length and
cut angles; then Jack rafter lengths and
cut angles:
H H/V 9 FEET 7-1/4 INCH
H PLMB 27.94°*
H LEVL 62.06°*
H CHK1 45.°
j JKOC 16
INCH
j JK 1 5 FEET 10 INCH
j JK 2 4 FEET 2 INCH
j JK 3 2 FEET 6 INCH
j JK 4 0 FEET 10 INCH
(Cont’d)
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