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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?

Note: Run is half the Span.

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.

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.

Find Diagonal and Pitch:

o o

6 f 1 1 i 1 / 2 r

1 4 f 6 i R

d

p

p