For a simple gable roof the span wall to wall will be twice the size of the run wall to ridge horizontally.
How to measure the pitch of a roof.
Roof pitch is the angle that is created as the rafter leaves the ceiling joist.
The roof s pitch is the number of inches the roof rises in 12 inches.
For a roof with the ridge above one wall the span is the same as the run.
One method to find the pitch is to climb on the roof and measure the rise for a 12 run.
Therefore mark off 12 inches on the level and place it down horizontally against the roof rafter.
First measure 12 inches from one end of the level and make a mark.
Position your level against the roof until the bubble of the vial sits between two lines.
Check the surface of the.
To see how pitch impacts the look of a garage and changes cost click the design center button on our pole barn kits page.
Before taking any measurements you must first confirm that it s safe to walk on your roof.
The slope is the same as the pitch.
Pitch measurement method 1 1.
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.
To use this method there are 3 possible places to take your measurements.
Measure the run length it is the horizontal distance between the roof ridge and the wall of the building.
The measurements are taken from the bottom of the rafters the procedure to calculate roof pitch is the same.
8 inches and you have an 8 in 12 pitch.
Roof slope calculator example of use.
If this distance measures 4 inches you have a 4 in 12 pitch.
For more complex roofs you may need to calculate it section by.
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.
You ll need a level that is 12 or longer and a tape measure.
Take a measurement of 12 inches using a level.
Calculate the rafter length substituting these values.
Next measure vertically from the 12 inch mark on the level straight up to the underside of the rafter as illustrated below.
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.
Take the measurement of the vertical.
Let s assume it is equal to 6 m.
This method tends to be more accurate because no layers of roofing are involved.
Let s say it is equal to 1 5 m.
Then in the attic place the end of the level against the bottom of a roof rafter and hold it perfectly level.
