How To Find Pitch Of Existing Roof

One method to find the pitch is to climb on the roof and measure the rise for a 12 run.

How to find pitch of existing roof.

Calculate the rafter length substituting these values into the following formula. 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. 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. X pitch 12 0 25 12 3.

Lastly you can have the roof pitch in the form of x 12. Angle arctan pitch arctan 0 25 14. Put again this value into an angle. 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 1 5 6 2 25 36 38 25rafter 38 25 6 18 m. If you need to find the pitch of an existing roof all you need is a level and a tape measure. First measure 12 inches from one end of the level and make a mark. You ll need a level that is 12 or longer and a tape measure.

Pitch rise run 1 5 6 25. Locate the level s 12 inch mark. Measure the rise of your roof. Calculate the roof pitch as the proportion of rise and run.

For a roof with the ridge above one wall the span is the same as the run. Access one of the rafters then take the measurement this way. Now it is 3 12 and can be written as 25 or 14. Pitch rise run 1 5 6 25.

For a simple gable roof the span wall to wall will be twice the size of the run wall to ridge horizontally. For more complex roofs you may need to calculate it section by. Working from the interior side of the roof you ll need access to a roof rafter to measure the pitch. The most precise way to find the roof s slope is by measuring it from the underside.

The slope is the same as the pitch. Use a level against the underside of the rafter you re measuring to get the most accurate value.