How Do You Figure The Pitch Of A Roof

Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m.

How do you figure the pitch of a roof.

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. This free roof pitch calculator will take your roof width see the picture and rise the height of the roof and will calculate the roof pitch both as numeric value and as a degree. 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 this formula is from the pythagorean theorem.

Let s say it is equal to 1 5 m. Pitch is the incline of the roof represented as the ratio of rise to the span twice the run. If this distance measures 4 inches you have a 4 in 12 pitch. Pitch rise run 1 5 6 25.

Use the following formula which also describes a right triangle. Here s an easy safe way to determine the pitch from inside your attic. First measure 12 inches from one end of the level and make a mark. Here are a couple examples.

You can also calculate roof pitch even without using a roof slope calculator. 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. Calculate the roof pitch as the proportion of rise and run. Here are the equations you may use to solve for the length of the slope and the rafter.

8 inches and you have an 8 in 12 pitch. To measure the roof pitch you ll need an 18 or 24 inch level a tape measure and a pencil. For a simple gable roof the span wall to wall will be twice the size of the run wall to ridge horizontally. If your roof pitch is greater than 3 your roof is considered pitched.

Pitch measurement method 1. Read more about roof pitch at wikipedia. 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. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.

Calculate the rafter length substituting these values into the following formula. One method to find the pitch is to climb on the roof and measure the rise for a 12 run. You ll need a level that is 12 or longer and a tape measure. If you do need to calculate the pitch an estimate or shortcut is usually more practical than measuring the roof s overall dimensions.