How To Figure Your Roof Pitch

Generally roof pitch is calculated from the same formula that describes a right triangle.

How to figure your roof pitch. Roof pitch is measured by rise run rise the distance from the top of a stud wall to the peak of the roof. How to measure roof pitch to measure the roof pitch you ll need an 18 or 24 inch level a tape measure and a pencil. You ll need a level that is 12 or longer and a tape measure. The slope is the same as the pitch.

You can use the following equations to find the length of the rafter and the slope. Rafter rise run from the pythagorean theorem. As aforementioned there is no standard pitch of a roof. For more complex roofs you may need to calculate it section by.

For example if the roof rises 4 feet and the span is 16 feet twice the run then the pitch is 4 16 or 1 4. Run the distance from the outside edge of a perimeter stud wall to the center of the house. One method to find the pitch is to climb on the roof and measure the rise for a 12 run. 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.

Even if you want to use a flat roof pitch calculator system you will be able to find one. Rise run pitch where pitch is expressed in percent. Pitch is the incline of the roof represented as the ratio of rise to the span twice the run. The run always remains.

For a roof with the ridge above one wall the span is the same as the run. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. Then in the attic place the end of the level against the bottom of a roof rafter and hold it perfectly level. If you want to know how to find the pitch of a roof then start with a calculator.

First measure 12 inches from one end of the level and make a mark. 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. Express roof pitch as the ratio of the amount of the vertical rise of a roof or rise over the corresponding horizontal distance or run you write the pitch assuming a run of 12 inches thus the ratio would describe how much a roof rises for each foot of the run.