Once you know the roof slope multiplier for a particular slope you can use it to find the actual area of any size sloped roof with the same slope.
How to find slope of roof.
There are a number of ways that you can calculate the roof slope of your home and you need to be aware of this.
It is often compared to slope but is not exactly the same.
The run always remains constant at 12 inches.
Locate the level s 12 inch mark.
How to convert roof pitch to degrees.
You can use the following equations to find the length of the rafter and the slope.
Roof pitch calculator results explained.
Rise run pitch where pitch is expressed in percent.
Angle the angle of a roof is the same as the roof s slope except instead of being.
Rafter rise run from the pythagorean theorem.
For example if your tape measure found a 6 inch vertical distance to the 12 inch mark on your level the slope is 6 12 or 6 in 12.
To find the angle of a roof in degrees convert the pitch to a slope then convert to degrees by finding the arc tangent of the slope.
The most precise way to find the roof s slope is by measuring it from the underside.
Calculate the roof slope.
Rise run rise run slope.
If it doesn t have this mark use a tape measure to locate.
There are two main categories of roofing.
Write the roof slope as the ratio of rise over run or vertical distance over horizontal distance.
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.
That is the roof s rise.
Roof pitch is the measurement of a roof s vertical rise divided by its horizontal run.
First convert the pitch to a slope.
Generally roof pitch is calculated from the same formula that describes a right triangle.
The picture below shows the pitch of a 7 12 roof slope meaning that for 12 of horizontal measurement roof run the vertical measurement roof rise is 7.
Roof slope style.
A low slope roof is anywhere from 2 in 12 to 4 in 12.
A flat roof has a slope of 2 in 12 or less.
If this isn t practical then perform the same measurement on the underside of.
To do this simply convert the rise and run as a fraction to a decimal form eg.
How to calculate roof pitch.
This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.
Use a level against the underside of the rafter you re measuring to get the most accurate value.
So in this case for every 12 inches the roof goes across horizontally b while rising 6 inches a there s actually 13 416 inches of roof c.
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.
