How To Determine Roof Slope

Thus a moderate 6 in 12 roof pitch means that the roof rises 6 inches vertically for every 12 horizontal inches it runs.

How to determine roof slope.

Pitch tan angle where angle is the roof pitch expressed in degrees. 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. For a roof with the ridge above one wall the span is the same as the run. Rise run rise run slope.

A roof s pitch is determined by how much it rises vertically for every foot it runs horizontally. For a simple gable roof the span wall to wall will be twice the size of the run wall to ridge horizontally. Roof pitch calculator results explained. To accurately calculate the area of your roof you must first determine its slope or pitch.

Now measure vertically from the 12 inch mark on the level straight up to the underside of the rafter as illustrated. How to determine or calculate roof pitch or roof slope roof pitch calculator is determined by the number of inches it rises vertically for every 12 inches it extends horizontally. The slope is the same as the pitch. This is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares.

Rise run pitch where pitch is expressed in percent. Use a level against the underside of the rafter you re measuring to get the most accurate value. To do this simply convert the rise and run as a fraction to a decimal form eg. For more complex roofs you may need to calculate it section by.

Access one of the rafters then take. How to calculate roof pitch. First measure 12 inches from one end of the level and make a mark. The most precise way to find the roof s slope is by measuring it from the underside.

To find the angle of a roof in degrees convert the pitch to a slope then convert to degrees by finding the arc tangent of the slope. Then in the attic place the end of the level against the bottom of a roof rafter and hold it perfectly level. Rafter rise run from the pythagorean theorem. Locate the level s 12 inch mark.