How To Measure The Pitch Of A Roof

Take a measurement of 12 inches using a level.

How to measure the pitch of a roof.

The slope is the same as the pitch. For a roof with the ridge above one wall the span is the same as the run. Let s say it is equal to 1 5 m. You ll need a level that is 12 or longer and a tape measure.

Take the measurement of the vertical. First measure 12 inches from one end of the level and make a mark. 8 inches and you have an 8 in 12 pitch. Therefore mark off 12 inches on the level and place it down horizontally against the roof rafter.

This method tends to be more accurate because no layers of roofing are involved. Roof pitch refers to the amount of rise a roof has compared to the horizontal measurement of the roof called the run. Calculate the rafter length substituting these values. Let s assume it is equal to 6 m.

Before taking any measurements you must first confirm that it s safe to walk on your roof. Then in the attic place the end of the level against the bottom of a roof rafter and hold it perfectly level. Check the surface of the. 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.

It can also be represented as the proportion between the rise and the run of the roof for example for every 1 metre in width the roof rises 1 metre in height or otherwise known as 45 degrees. To use this method there are 3 possible places to take your measurements. Next measure vertically from the 12 inch mark on the level straight up to the underside of the rafter as illustrated below. The roof s pitch is the number of inches the roof rises in 12 inches.

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. The measurements are taken from the bottom of the rafters the procedure to calculate roof pitch is the same. Measure the rise of your roof. For a simple gable roof the span wall to wall will be twice the size of the run wall to ridge horizontally.

One method to find the pitch is to climb on the roof and measure the rise for a 12 run. For more complex roofs you may need to calculate it section by. Roof slope calculator example of use. Roof pitch is the angle that is created as the rafter leaves the ceiling joist.

If this distance measures 4 inches you have a 4 in 12 pitch. Measure the run length it is the horizontal distance between the roof ridge and the wall of the building. Position your level against the roof until the bubble of the vial sits between two lines.