Access one of the rafters then take the measurement this way.
How to find slope of roof.
When you want to replace or repair your roof you need to know about the slop of the roof the reason for this is the simple fact that roof slope can affect the overall cost of replacing or repairing the 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.
Angle the angle of a roof is the same as the roof s slope except instead of being.
First convert the pitch to a slope.
The most precise way to find the roof s slope is by measuring it from the underside.
How to calculate roof pitch.
Generally roof pitch is calculated from the same formula that describes a right triangle.
If it doesn t have this mark use a tape measure to locate.
Locate the level s 12 inch mark.
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.
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.
How to convert roof pitch to degrees.
It is often compared to slope but is not exactly the same.
Conventional slope roof range between 4 in 12 and 8 in 12.
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.
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.
Roof pitch is the measurement of a roof s vertical rise divided by its horizontal run.
The run always remains constant at 12 inches.
A low slope roof is anywhere from 2 in 12 to 4 in 12.
Calculate the roof slope.
This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.
Rise run rise run slope.
Use a level against the underside of the rafter you re measuring to get the most accurate value.
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.
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.
Rafter rise run from the pythagorean theorem.
There are two main categories of roofing.
Rise run pitch where pitch is expressed in percent.
To do this simply convert the rise and run as a fraction to a decimal form eg.
Roof slope style.
If this isn t practical then perform the same measurement on the underside of.
Roof pitch calculator results explained.
You can use the following equations to find the length of the rafter and the slope.
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.
