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.
How do you measure the slope of a roof.
Outside of the u s a degree angle is typically used.
A flat roof has a slope of 2 in 12 or less.
That is the roof s rise.
For instance a 7 12 roof pitch means that the roof rises 7 inches for every 12 horizontal inches.
Either way let s see how you can calculate the slope of a roof without using a roof slope calculator.
Access one of the rafters then take the measurement this way.
Angle the angle of a roof is the same as the roof s slope except instead of being.
To find the slope in degrees you divide the rise by the run and find the inverse tangent of the result.
Roof slope style.
Then in the attic place the end of the level against the bottom of a roof rafter and hold it perfectly level.
The run always remains constant at 12 inches.
First measure 12 inches from one end of the level and make a mark.
Measuring the slope from the rafters.
Let s say it is equal to 1 5 m.
The easiest way to do this is by accessing a rafter in your attic if you can.
However if you have a more complex roof you.
Roof pitch calculator results explained.
A low slope roof is anywhere from 2 in 12 to 4 in 12.
But you still need to have the rise and the run to find the degree angle if you don t already know it.
The most precise way to find the roof s slope is by measuring it from the underside.
If you do know the roof slope in degrees then all you have to do is find the secant using a scientific calculator.
For example if the.
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.
Let s assume it is equal to 6 m.
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.
Use a level against the underside of the rafter you.
It is often compared to slope but is not exactly the same.
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.
Calculate the rafter length substituting these values into the following formula.
Measure from the end of the level up to the bottom edge of the rafter.
Roof slope calculator example of use.
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.
Measure the run length it is the horizontal distance between the roof ridge and the wall of the building.
To measure the roof pitch you ll need an 18 or 24 inch level a tape measure and a pencil.
