How Do You Determine The Pitch Of A Roof

Rafter rise run from the pythagorean theorem.

How do you determine the pitch of a roof.

Roof pitch calculator results explained. If you want to know how to find the pitch of a roof then start with a calculator. Rise run pitch where pitch is expressed in percent. Also referred to as roof slope or roof slant so what does the 7 12 in the example to the right mean.

Then enter the value of the run and choose the unit of measurement from the drop down menu. For a roof with the ridge above one wall the span is the same as the run. Here are the steps to follow for the roof angle calculator. Roof pitch calculator is determined by the number of inches it rises vertically for every 12 inches it extends horizontally.

This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. First enter the value of the rise and choose the unit of measurement from the drop down menu. For more complex roofs you may need to calculate it section by section. The 7 means that the roof rises 7 for every 12 it runs.

To determine the y height measure from the bird s mouth up the calculated slope x in 12 to the top of the rafter. Divide the slope by two to get the pitch. Finally enter the value of the rafter length and. 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.

Then multiply the slope by 12 to get the rise. 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. The slope is the same as the pitch. The top of the ridge beam m y.

How to calculate roof pitch. Hold the level straight and level bubble centered and then measure the vertical distance down from the your 12 mark on the level down to the roof. This is the amount your roof inclines in a 1 foot span or the pitch of your roof. Place the end of your level the 0 inch point of your 12 marking against the roof surface.

Pitch tan angle where angle is the roof pitch expressed in degrees. For a simple gable roof the span wall to wall will be twice the size of the run wall to ridge horizontally. To determine the finished height of the ridge beam add the rise m and the y height. 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.