How Do You Determine Roof Slope

To do this you will need to write down the measurements that you have taken from the rafters.

How do you determine roof slope.

For a roof with the ridge above one wall the span is the same as the run. For a simple gable roof the span wall to wall will be twice the size of the run wall to ridge horizontally. Use a level against the underside of the rafter you re measuring to get the most accurate value. How do you calculate the slope of a roof.

The slope of your roof is the ratio of the vertical distance or rise of the roof to the horizontal distance or run. How roof pitch is calculated to accurately calculate the area of your roof you must first determine its slope or pitch. A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally. The most precise way to find the roof s slope is by measuring it from the underside.

This will allow your project to carry the depth and detail in the roof that you wanted as well as make sure that it will maintain a sturdy and effective nature throughout. Rise run pitch where pitch is expressed in percent. How to calculate roof pitch. Rafter rise run from the pythagorean theorem.

Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs. The slope is the same as the pitch. Locate the level s 12 inch mark. If you want to know how to find the pitch of a roof then start with a calculator.

Pitch tan angle where angle is the roof pitch expressed in degrees. You will now be able to determine the slope of your roof.