User`s guide

72 — CONSTRUCTION MASTER
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PRO
Jack Rafters — Using Other Than 16 Inch On-Center
Spacing (not available on LT)
A roof has a 9/12 pitch and a run of 6 feet 9 inches. Find the Jack raf-
ter lengths and cut angles at 18-inch (versus 16-inch) on-center
spacing.
Keystroke Display
1. Enter pitch, run and spacing:
[On/C] [On/C] 0.
9 [Inch] [Pitch] PTCH 9 INCH
6 [Feet] 9 [Inch] [Run] RUN 6 FEET 9 INCH
18 [Inch] [Stor] [7] OC 18 INCH
2. Find Jack rafter lengths and cut angles:
[Jack] JKOC 18 INCH
[Jack] JK1 6 FEET 6-3/4 INCH
[Jack] JK2 4 FEET 8-1/4 INCH
[Jack] JK3 2 FEET 9-3/4 INCH
[Jack] JK4 0 FEET 11-1/4 INCH
[Jack] JK5 0 FEET 0 INCH
[Jack] PLMB 36.87°°
[Jack] LEVL 53.13°°
[Jack] CHK1 45.00°°