Computing Roof Pitch
You have a roof where your Rise is 7 feet 10-
1/2 inches and your Run is 13 feet 6 inches.
What’s the Pitch?*
COMMENTS KEYSTROKES
Clear calculator [On/C] [On/C]
Enter Rise 7 [Feet] 10 [Inch]
1 [/] 2 [Rise]
Enter Run 13 [Feet]
6 [Inch] [Run]
Find Pitch [Pitch]
Answer: 7 IN
HIP & VALLEY RAFTERS
— (Regular 45-Degree)
You’re working with a 7-in-12 Pitch, and half
your total span is 13 feet 9 inches: (A) Find the
point-to-point length for the common rafter and
(B) Find the length of an adjoining hip (or valley).
COMMENTS KEYSTROKES
Clear calculator [On/C] [On/C]
Step 1 — Find Common Rafter Length
Enter Run of common 13 [Feet]
rafter 9 [Inch] [Run]
Enter roof Pitch 7 [Inch] [Pitch]
Find common rafter [Diag]
Answer: 15 FT 11-1/64 IN
Step 2 — Find Hip Rafter Length
Find adjacent hip [Hip/V]
Answer: 21 FT 0-27/64 IN
* This could also be solved “long-hand” by directly dividing
the two feet-inch dimensions, and then entering the
resulting answer (.583333) as the Pitch ([=] [Pitch]). Pressing
Pitch again would show the same 7 IN PITCH answer as
shown above.
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