How To Work Out Your Roof Pitch

First measure 12 inches from one end of the level and make a mark.

How to work out your roof pitch.

To measure the roof pitch you ll need an 18 or 24 inch level a tape measure and a pencil. For a roof with the ridge above one wall the span is the same as the run. You ll need a level that is 12 or longer and a tape measure. Pitch rise run 1 5 6 25.

Before taking any measurements you must first confirm that it s safe to walk on your 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 say it is equal to 1 5 m. Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m.

The slope is the same as the pitch. Calculate the rafter length substituting these values into the following formula. Check the surface of the. Roof pitch calculator results explained slope the slope of a roof is represented as x 12 where x is the number of inches in rise for every 12 inches of run.

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. Position your level against the roof until the bubble of the vial sits between two lines. Calculate the roof pitch as the proportion of rise and run.

Then in the attic place the end of the level against the bottom of a roof rafter and hold it perfectly level. Take the measurement of the vertical. This is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares. For more complex roofs you may need to calculate it section by.

Take a measurement of 12 inches using a level.