Understanding Roof Pitch

For example a roof that rises 6 inches for every 12 inches of horizontal run has a 6 in 12 pitch.

Understanding roof pitch.

Pitch compares the roof s span to the rise while slope compares rise and run. The angle or pitch of a roof is calculated by the number of inches it rises vertically for every 12 inches it extends horizontally. They do not mean the same thing. The term pitch and slope are often used interchangeably which is incorrect.

Simply put roof pitch is the measurement of the angle or the steepness of your roof. The pitch of your roof is determined by the measurement of the vertical rise by the horizontal run. This implies a rooftop that is 4 inches higher than it was 12 creeps back assessing on a flat plane is a four and twelve rooftop. Mathematically the pitch of a roof is different calculation than roof slope.

For example if a roof is 8 feet high and spreads out from the center covering 12 feet in each direction the rise over the run would be 8 12. Because it is one of the many key elements that determine the safety of the roof over your head there is a very good reason to understand the purpose of roof pitch. How to measure roof pitch. To calculate pitch you simply divide rise by span and display your result as a fraction.

A roof that ascents six inches each twelve level inches is depicted as a 6 and 12 roof. A 12 to 24 pitch is expressed as 1 2. You ll often hear experts express pitch as x over y. For example given a roof with a rise of 4 feet and a span of 24 feet the pitch is 1 to 6 pitch which can be expressed as the fraction of 1 6.