Page 36
KEY INPUT & DISPLAY
0
RUN 10
Feet
5
Inch
1. Calcuate common rafter measurements:
PTCH 7
Inch
DIAG 12
Feet
0-11/16
Inch
PLMB 30.26˚
LEVL 59.74˚
H/V 15
Feet
11-1/4
Inch
PLMB 22.42˚
2. Calculate hip/valley rafter measurements:
LEVL 67.58˚
CHK1 45.00˚
JKOC 16
Inch
*
3. Calculate the incremental jack adjustment and regular rack rafter lengths and cut angles:
INCR 1
Feet
6-1/2
Inch
REGULAR HIP/VALLEY AND JACK RAFTERS
Example: A roof has a 7 Inch Pitch, and a span of 21 Feet (run = 10 Feet 5 Inches). Assume that the
jack rafters have a 16-Inch On-center spacing between them. Calculate the following:
1. For the common rafter: point-to-point length, angles for plumb and level cuts
2. For the hip/valley rafter: length, angles for plumb, level, and cheek cuts
3. Use the stored On-center spacing to calculate the incremental jack adjustment, regular jack
rafter lengths and angles for the plumb, level, and cheek cuts.
Cont’d on page 38
DIAG 4
Feet
0
Inch
2. Enter width of plywood:
RUN 3
Feet
5-7/16
Inch
3. Find length of sheathing:
STORED
SHEATHING CUT
Example: You are applying sheathing to a roof with a Pitch of 7 Inches, using a piece of plywood
measuring 4 Feet by 8 Feet, with the 8 Foot side along the plate. Calculate the run to nd the length of
sheathing material you need to cut.
KEY INPUT & DISPLAY
0
PTCH 7
Inch
1. Enter Pitch
On/C On/C
Pitch
Inch
7
Hip/V
On/C On/C
Pitch
Run
Diag
Feet Inch
7
51
0
Inch
Diag
Diag
Hip/V
Hip/V
Hip/V
DiagFeet
4
Run
Jack
Jack
*If display does not show JKOC 16 INCH (the default), reset the value by reset pressing .
This same method can be used to store a different On-center spacing value if needed.
Inch
Stor
5
6
1
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