Formula To Find The Slope Of A Roof

As a sanity check we confirm that the tangent of 45 degrees is 1 or that two opposed 45 degree or 12 in 12 slope roof surfaces will form a 90 degree angle where they meet at the ridge and will form 45 degree angles where they meet the wall top plate or with respect to any horizontal line in the building.

Formula to find the slope of a roof.

Just write down the measurements you found. Roof slope style. Rafter rise run from the pythagorean theorem. If you know the angle of the roof in degrees you can find the roof pitch by converting the angle in degrees to a slope then finding the rise by multiplying the slope by 12.

In the imperial unit of measurements the slope is expressed with the rise and run. Conventional slope roof range between 4 in 12 and 8 in 12. In civil engineering the slope is the numerical measure of the steepness of a roof. Slope tan degrees.

Tan 45o 1 00. Roof slope is also called as roof pitch. For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches. Use the following formula which also describes a right triangle.

You can also calculate roof pitch even without using a roof slope calculator. Roof pitch calculator results explained slope the slope of a roof is represented as x 12 where x is the number of inches in rise for every 12 inches of run. Then multiply the slope by 12 to get the rise. How to calculate roof pitch.

In the united states a run of 12 inches 1 foot is used and pitch is measured as the rise of the roof over 12 inches. The picture below shows the pitch of a 7 12 roof slope meaning that for 12 of horizontal measurement roof run the vertical measurement roof rise is 7. The run always remains constant at 12 inches. Generally roof pitch is calculated from the same formula that describes a right triangle.

By slope angle formula steepness can be obtained by dividing vertical rise by horizontal span. Roof pitch degree table. The slope of your roof is the ratio of vertical distance rise to horizontal distance run. Outside of the u s a degree angle is typically used.

There are two main categories of roofing. Rise run pitch where pitch is expressed in percent. It is often compared to slope but is not exactly the same. Rafter rise run this formula is from the pythagorean theorem.

That is the roof s rise. A flat roof has a slope of 2 in 12 or less. There s no need to simplify them. This is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares.

A low slope roof is anywhere from 2 in 12 to 4 in 12. Image 1 12 to 12 12 roof pitch 7 12 pitch.