How Do I Figure The Pitch Of A Roof

8 inches and you have an 8 in 12 pitch.

How do i figure the pitch of a roof.

Roof slope calculator example of use. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. Divide the slope by two to get the pitch. 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.

Here are the steps to follow for the roof angle calculator. Pitch is the incline of the roof represented as the ratio of rise to the span twice the run. If you do need to calculate the pitch an estimate or shortcut is usually more practical than measuring the roof s overall dimensions. One method to find the pitch is to climb on the roof and measure the rise for a 12 run.

On the roof hold the level perfectly level and measure the height from the roof to the level 12 inches away from where the level touches the surface this will be the rise. Measure the rise of your roof. Here are a couple examples. Pitch measurement method 1.

Then in the attic place the end of the level against the bottom of a roof rafter and hold it perfectly level. You ll need a level that is 12 or longer and a tape measure. 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. Here s an easy safe way to determine the pitch from inside your attic.

Calculate the rafter length substituting these values. To measure the roof pitch you ll need an 18 or 24 inch level a tape measure and a pencil. First enter the value of the rise and choose the unit of measurement from the drop down menu. Then enter the value of the run and choose the unit of measurement from the drop down menu.

On a ladder beside the roof place the level a foot or so up the roof hold it level and measure from the 12 inch mark on the level s bottom straight down to the roof. For a simple gable roof the span wall to wall will be twice the size of the run wall to ridge horizontally. Let s assume it is equal to 6 m. Measure the run length it is the horizontal distance between the roof ridge and the wall of the building.

Let s say it is equal to 1 5 m. If this distance measures 4 inches you have a 4 in 12 pitch. Divide the results by the number of 12 inch segments in your level. Finally enter the value of the rafter length and.