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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
1. Find Diagonal or Point-to-Point length of the Common rafter:
o o
7 i p
1 4 f 4 i ÷ 2 =
R
d
2. Find Plumb and Level cuts:
d
d
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
Find Diagonal and Pitch:
o o
6 f 1 1 i 1 / 2 r
1 4 f 6 i R
d
p
p
DISPLAY
PTCH 7
7
FEET
X 7
FEET
R 8
3-9/16
FEET
PLMB 30.25644°
LEVL 59.74356°
DISPLAY
Y 6
11-1/2
FEET
X 14
FEET
R 16
FEET
PTCH 5-3/4
/ _ Ø 25.63565°
U
'
G
SER
S
UIDE
0.
INCH
2
INCH
2
INCH
INCH
0.
INCH
6
INCH
1
INCH
INCH
— 87
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