What Is Roof Pitch?

What is Roof Pitch and How Do I Measure It?

Roof Pitch is the number of inches the roof rises across 12 horizontal inches. Roof Pitch is also known as Rise over Run or Rise/Run. For an example a 7/12 pitch roof means that the roof rises 7" for every 12" it runs.

How to Measure Your Roof Pitch

To measure your roof pitch, mark a level at 12" from the top of the roof. Hold it perfectly level and then, with a tape measure, measure the rise of the roof. This can also be done from in the attic using the rafters as your slope guide.

The examples below illustrate Rise/Run roof pitch. Notice the smaller the first number (rise) the shallower the roof pitch (slope).





All vertically terminated chimney systems have to be terminated 2' above any combustable material within 10'. After you determine your chimney pitch, the easiest way to figure out how tall the chimney will stick out of your roof is as follows:

EXAMPLE: 6/12 pitch

  • Take the first number 6 X 10 = 60 +2' = 84"
  • Therefore, it would stick out 7'.
  • Anything over 5' requires a roof support kit.


If you have more questions about your roof pitch, please call us at (844) 755-1110 or email [email protected].



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