In the united states a run of 12 inches 1 foot is used and pitch is measured as the rise of the roof over 12 inches.
How do you measure the slope of a roof.
But you still need to have the rise and the run to find the degree angle if you don t already know it.
That is the roof s rise.
For example if the.
Then in the attic place the end of the level against the bottom of a roof rafter and hold it perfectly level.
A low slope roof is anywhere from 2 in 12 to 4 in 12.
Calculate the rafter length substituting these values into the following formula.
The most precise way to find the roof s slope is by measuring it from the underside.
Roof slope style.
Roof pitch calculator results explained.
It is often compared to slope but is not exactly the same.
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 this is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares.
Access one of the rafters then take the measurement this way.
Outside of the u s a degree angle is typically used.
The easiest way to do this is by accessing a rafter in your attic if you can.
Let s say it is equal to 1 5 m.
Measure the run length it is the horizontal distance between the roof ridge and the wall of the building.
Either way let s see how you can calculate the slope of a roof without using a roof slope calculator.
For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches.
Measure the rise of your roof.
There are two main categories of roofing.
Use a level against the underside of the rafter you.
Angle the angle of a roof is the same as the roof s slope except instead of being.
To measure the roof pitch you ll need an 18 or 24 inch level a tape measure and a pencil.
Roof slope calculator example of use.
The run always remains constant at 12 inches.
Measure from the end of the level up to the bottom edge of the rafter.
Measuring the underside of the roof is actually the most accurate way of calculating the slope of the roof as there are no materials which will create an uneven surface.
Let s assume it is equal to 6 m.
However if you have a more complex roof you.
The rafters that will provide you with the best measurements are the rafter in the attic the overhang rafter at the end of the roof and the barge rafter which is located to.
First measure 12 inches from one end of the level and make a mark.
Measuring the slope from the rafters.
A flat roof has a slope of 2 in 12 or less.
After measuring the slope estimate the roof pitch by dividing the slope by 2 if you have a simple gable roof.
