Standard Roof Pitch Angles

Find all the needed factors in order to determine the pitch angle s degree.

Standard roof pitch angles. Pitches above 9 12 are very highly angled and are designated steep slope roofs. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. Locate its tangent or tan and follow the left row for you to read its corresponding degree. Roof pitch varies depending on culture climate style and available materials.

With insufficient pitch a roof can leak rain and with a pitch too great its stones will fall loose. Commonly it is 3 4 th of span as per gothic rafter must be equal to span. So use the 12 inch level as a constant run and 18 inch ruler as a variable rise. Some sources consider low slope to include 3 12 pitch roofs.

They have a pitch ranging from 4 12 to 9 12. If a roof increases in height by four inches for every foot of horizontal run it is considered to have a 4 in 12 pitch or just a 4 pitch talk in terms of pitches and you will always be understood in the roofing universe. This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees. In the uk the typical house has a pitch between 40 50 although 45 should be avoided.

High pitched roofs often need extra fasteners and their pitch can be as high as 21 12. 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. Low slope roofs are from 0 to 3 12 in pitch. In the usa the range of standard pitches is anywhere between 4 12 and 9 12.

You can also calculate roof pitch even without using a roof slope calculator. Pitches of less than 2 12 are considered flat roofs even though they may be very slightly angled. There is no standard universal roof pitch. The most commonly used roof pitches fall in a range between 4 12 and 9 12.

Display of roof pitches 1 12 through 18 12. Usually average roof pitch is determined using the same roof length method. If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks. Thatch is one of the oldest roofing materials and needs a steep pitch to drain properly some types of stone roofs have a very restrictive roof pitch.

The 12 inch run is considered standard in roof pitch or angle terminologies. On blue prints architects engineers usually display the pitch of a roof in the format shown on the image where number 4 represents a rise and number 12 represents a length. Use the following formula which also describes a right triangle. Roof pitch and corresponding angles.