User Manual

USER’S GUIDE — 87
Common Rafter Length
If a roof has a 7/12 Pitch and a Span of 14 Feet 4 Inches, what is
the Point-to-Point length of the Common rafter (excluding the over-
hang or ridge adjustment)? What are the Plumb and Level cuts?
KEYSTROKE DISPLAY
1. Find Diagonal or Point-to-Point length of the Common rafter:
o o 0.
7 i p PTCH 7 INCH
1 4 f 4 i ÷ 2 = 7 FEET 2 INCH
R X 7 FEET 2 INCH
d R 8 FEET 3-9/16 INCH
2. Find Plumb and Level cuts:
d PLMB 30.25644°
d LEVL 59.74356°
Common Rafter Length — Pitch Unknown
Find the Common rafter length for a roof with a Rise of 6 Feet 11-1/2
Inches and a Run of 14 Feet 6 Inches. Solve for the Pitch in
Degrees and in Inches.
KEYSTROKE DISPLAY
Find Diagonal and Pitch:
o o 0.
6 f 1 1 i 1 / 2 r Y 6 FEET 11-1/2 INCH
1 4 f 6 i R X 14 FEET 6 INCH
d R 16 FEET 1 INCH
p PTCH 5-3/4 INCH
p /
_
Ø 25.63565°