Standard Roof Pitch Angles

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.

Standard roof pitch angles.

High pitched roofs often need extra fasteners and their pitch can be as high as 21 12. Roof pitch varies depending on culture climate style and available materials. Display of roof pitches 1 12 through 18 12. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.

Commonly it is 3 4 th of span as per gothic rafter must be equal to span. There is no standard universal roof pitch. Roof pitch and corresponding angles. Pitches of less than 2 12 are considered flat roofs even though they may be very slightly angled.

So the pitch of a roof is determined by how many inches the slope rises for every 12 inches it runs horizontally. 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. They have a pitch ranging from 4 12 to 9 12. This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees.

The 12 inch run is considered standard in roof pitch or angle terminologies. In the uk the typical house has a pitch between 40 50 although 45 should be avoided. So use the 12 inch level as a constant run and 18 inch ruler as a variable rise. Locate its tangent or tan and follow the left row for you to read its corresponding degree.

Pitches above 9 12 are very highly angled and are designated steep slope roofs. Use the following formula which also describes a right triangle. Usually average roof pitch is determined using the same roof length method. Pitches lower than 4 12 have a slight angle and they are defined as low slope roofs.

With insufficient pitch a roof can leak rain and with a pitch too great its stones will fall loose. Find all the needed factors in order to determine the pitch angle s degree. 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.

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. The most commonly used roof pitches fall in a range between 4 12 and 9 12. If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks. You can also calculate roof pitch even without using a roof slope calculator.