![]() Use Standard Pitch to Find the Multiplier You multiply the roof pitch multiplier by the run (length of the horizontal distance covered) of a common rafter to find its actual length. You multiply the roof pitch multiplier by the area, or footprint, covered by a sloped roof to find the actual surface area of the roof. What is a Roof Pitch Multiplier?Ī roof pitch multiplier, also called a roof pitch factor, is a number that you use to find the actual surface area of a pitched roof or the length of a common rafter. In order to help more people find what they’re looking for, we are using the “X/12” form in our roof pitch multiplier table below. In roofing industry literature, the standard abbreviation used for indicating a particular roof pitch has a colon and takes the form “X:12” or “X : 12”, so for a 7 in 12 pitch, you would write “7:12 pitch”.Īs a practical matter, it seems like almost everyone searching for information about roof pitch on the internet is searching for a roof pitch using a slash, as in “7/12”. When you talk about roof pitch, the correct way to say a specific pitch is to use the format “X-in-12”, so if you’re talking about a roof that rises 7 units for every 12 units it runs horizontally, you would say that the roof has a 7 in 12 pitch. Note on Proper Format When Stating Roof Pitch ![]() An accurate measurement of the slope is one of the most important pieces of information to have about a roof.
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