If you can t get to your attic you can measure slope on your rooftop as long as it s safe to go up there.
How do i work out the pitch of my roof.
Then in the attic place the end of the level against the bottom of a roof rafter and hold it perfectly level.
First measure 12 inches from one end of the level and make a mark.
Pitch this is the incline of the roof expressed as a fraction.
Before you calculate roof pitch you ll need to measure the slope of your roof.
Calculate the roof pitch as the proportion of rise and run.
The easiest way to do this is by accessing a rafter in your attic if you can.
Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m.
You can also estimate a roof pitch by eyeballing it from the ground from the gable side with a level and ruler.
Divide the results by the number of 12 inch segments in your level.
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.
For example if you used a 24 inch level and your measurement was 12 inches the pitch in your roof is 6 in 12.
As aforementioned there is no standard pitch of a roof.
Simply mark a level at 12 hold it perfectly level and measure from the roof surface to your 12 mark this.
While pitch and slope are used interchangeably they are not the same span also known as gable width this is based on the total footprint of the house and refers to the distance between two exterior walls.
One method to find the pitch is to climb on the roof and measure the rise for a 12 run.
The example to right shows 2 different ways to determine or calculate roof pitch also called roof slope.
Even if you want to use a flat roof pitch calculator system you will be able to find one.
The 7 means that the roof rises 7 for every 12 it runs.
Example a the measurements are taken from on top of the roof.
Express roof pitch as the ratio of the amount of the vertical rise of a roof or rise over the corresponding horizontal distance or run you write the pitch assuming a run of 12 inches thus the ratio would describe how much a roof rises for each foot of the run.
Enter any pitch or fraction of pitch to find angle.
This is our pitch calculator which will convert pitch to angle or angle to pitch for half degree roof slope calculations.
Enter any angle or fraction of angle to find pitch.
Let s say it is equal to 1 5 m.
Pitch rise run 1 5 6 25.
Measure the rise of your roof.
After measuring the slope estimate the roof pitch by dividing the slope by 2 if you have a simple gable roof.
To measure the roof pitch you ll need an 18 or 24 inch level a tape measure and a pencil.
You ll need a level that is 12 or longer and a tape measure.
