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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 find the length of
sheathing material you need to cut.
KEY INPUT & DISPLAY
1. Enter Pitch
On/C
On/C
7
Inch
Pitch
2. Enter width of plywood:
4
Feet
Diag
3. Find length of sheathing:
Run
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.
KEY INPUT & DISPLAY
1. Calcuate common rafter measurements:
On/C
On/C
1
0
5
Feet
7
Inch
Pitch
Diag
Diag
Diag
2. Calculate hip/valley rafter measurements:
Hip/V
Hip/V
Hip/V
Hip/V
3. Calculate the incremental jack adjustment and regular rack rafter lengths and cut angles:
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.
Jack
Inch
Run
Page 36
PTCH 7
Inch
DIAG 4
0
Feet
Inch
RUN 3
5-7/16
Feet
Inch
RUN 10
5
Feet
Inch
PTCH 7
Inch
DIAG 12
0-11/16
Feet
Inch
PLMB 30.26˚
LEVL 59.74˚
H/V 15
11-1/4
Feet
Inch
PLMB 22.42˚
LEVL 67.58˚
CHK1 45.00˚
JKOC
16
STORED
Inch
.
1
6
5
Inch
Stor
INCR 1
6-1/2
Feet
Inch
Cont'd on page 38
0
0
*
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