Common Rafter Length; Common Rafter Length - Pitch Unknown - Calculated Industries 44080 Construction Master Pro Desktop v3.0 User Manual

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 overhang
or ridge adjustment)? What are the Plumb and Level cuts?
Note: Run is half the Span.
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
Note: The Common rafter calculation is the "point-to-point" length and does not
include the overhang or ridge adjustment.
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
64 — C
ONSTRUCTION
M ® P / T
ASTER RO
RUN 7
DIAG 8
RISE 6
RUN 14
DIAG 16
PTCH 5-3/4
/ D
RIG ESKTOP
DISPLAY
0.
PTCH 7
INCH
7 2
FEET INCH
2
FEET INCH
3-9/16
FEET INCH
PLMB 30.26°
LEVL 59.74°
DISPLAY
0.
11-1/2
FEET INCH
6
FEET INCH
1
FEET INCH
INCH
PTCH 25.64°