Common Rafter
— Pitch Known
The roof you are working on has a 7-in-12
Pitch, and you know the overall span of the
building is 23 feet 6 inches. What length should
you cut the common rafters (not counting the
overhang or ridge adjustment)?
23’ 6”
7/12 Pitch
COMMENTS KEYSTROKES
Clear calculator [On/C] [On/C]
Enter Pitch 7 [Inch] [Pitch]
Calculate Run 23 [Feet] 6 [Inch]
[÷] 2 [=] 11 FT 9 IN
Enter as Run [Run]
Find rafter length [Diag]
Answer: 13 FT 7-15/64 IN
User’s Guide — 39
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