Roofs with pitches above 3 12 often use architectural shingles or modified bitumen materials.
Exampl of roof pitch.
The exact roof slope in degrees is given by the arctangent.
Thus pitch is typically greater in areas of high rain or snowfall.
Definitions vary on when a roof is considered pitched.
The way pitch also known as roof slope is measured is rise over run.
Most roof s have a pitch in the 4 12 to 9 12 range.
We included a roof pitch chart below the 7 12 example image and the calculator below that.
In degrees 10 2 in 12 or 1 in 6 is considered a minimum.
Let s assume it is equal to 6 m.
Roof slope calculator example of use.
Roof pitch is a measurement of a roof s slope expressed as a ratio.
Many factors determine which roofing materials you can use and one make or break factor is the slope of the roof known as roof pitch.
Measure the run length it is the horizontal distance between the roof ridge and the wall of the building.
So if your roof rises 4 inches for every 12 inches of horizontal length then the pitch of your roof is expressed as 4 12.
One of the most important aspects of trying to get the roof right though is the pitch.
If this isn t practical then perform the same measurement on the underside of the roof.
Let s say it is equal to 1 5 m.
Understanding a roof s pitching can be quite tough if you are just getting started and working with a roofer can leave you a little bit unsure about what is being suggested with regard to the job there s so much to learn that it can become a bit baffling.
Roof pitch refers to the measurement of the slope of a roof and you express this as a ratio.
Arctan 3 12 14 0 the primary purpose of pitching a roof is to redirect water and snow.
For example you may think you want classic composite shingles on your roof but if the pitch is below a certain ratio you may be forced to install a different type of roofing perhaps rolled roofing or standing seam metal roofing.
Calculate the rafter length substituting these values into the following formula.
For example a roof with a pitch of 2 12 3 12 will work best with 3 tab shingles the roofing most commonly found on homes in jacksonville.
The table below shows common roof pitches and the equivalent grade degrees and radians for each.
Image 1 12 to 12 12 roof pitch 7 12 pitch.
Roof pitch degree table.
Roof pitch is the measurement of roof steepness.
A pitch over 9 12 is considered a steep slope roof between 2 12 and 4 12 is considered a low slope roof and less than 2 12 is considered a flat roof.
A ratio is the most common way of expressing roof pitch or roof slope but degrees are also possible.
