© 2022 Johnson Level & Tool — 31
EXAMPLES
IRREGULAR HIP/VALLEY
You’re working with a 7/12 Pitch and half of your overall
Span is 15 Feet 7 Inches . The Irregular Pitch is 8/12 . Find
the Common rafter length, Irregular Hip/Valley and Jack
rafter lengths
KEYSTROKE DISPLAY
On/C
On/C
0
1 . FIND THE COMMON RAFTER LENGTH:
7
Inch
Pitch
PTCH 7 INCH
1
5
Feet
7
Inch
Run
RUN 15 FEET 7 INCH
Diag
DIAG 18 FEET 0-1/2 INCH
2 . FIND IRREGULAR HIP RAFTER LENGTH:
8
Inch
Conv
Hip/V
IPCH 8 INCH
Hip/V
IH/V 22 FEET 7-3/8 INCH
3 . FIND IRREGULAR JACK LENGTHS:
Conv
Jack
IJOC
STORED
16 INCH
Jack
*
IJ 1 14 FEET 11-13/16 INCH
Jack
IJ 2 13 FEET 7 INCH
Jack
IJ 3 12 FEET 2-3/16 INCH
Jack
IJ 4 10 FEET 9-3/8 INCH
Jack
IJ 5 9 FEET 4-1/2 INCH
Continue pressing
Jack
until last regular Jack or “0 .” is
reached .
* It is not necessary to keep pressing
Conv
when
displaying the Irregular Jack sizes .