Calculated Industries 4090 - Manual (Page 88)

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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 /_ Ш 25.63565°