Standard Roof Tilt Angle

Pitches above 9 12 are very highly angled and are designated steep slope roofs.

Standard roof tilt angle.

Most roofs have an inclination of 30 to 40 degrees. Pitch angle incline slope they all can be used to refer to the steepness of a roof. Pitches lower than 4 12 have a slight angle and they are defined as low slope roofs. In the roofing trade the go to term is pitch and it is expressed in terms of 12 inches so the pitch of a roof is determined by how many inches the slope rises for every 12 inches it runs horizontally.

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. Pitches of less than 2 12 are considered flat roofs even though they may be very slightly angled. At this level the solar panel can lie flat on the roof and get enough sunlight to produce enough electricity. Locate its tangent or tan and follow the left row for you to read its corresponding degree.

Roof pitch or slope is a measure of vertical rise to horizontal run expressed in inches per foot. Roof pitch and corresponding angles. In case the roof is very steep you may not be able to get the most optimal tilt angle for the panel especially if it is lower than the angle of the roof. These are utilized in residential applications.

This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. The roof pitch is important in determining the appropriate installation method and how much roofing material will be needed. If the solar system is being ground mounted or tilted up on a flat roof top the tilt angle is also used to determine the row spacing of the array so the front row. A 4 12 is a roof slope that rises by 4 inches for every 12 inches across.

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 12 inch run is considered standard in roof pitch or angle terminologies. Some of the most common roof pitch types are conventional slope type roofs designed with pitch ranging from 4 12 to 9 12. So use the 12 inch level as a constant run and 18 inch ruler as a variable rise.

This means if a roof rises 4 in the length of 12 your roof pitch would be 4 12 or 18 43 degrees. Roof pitch is used to describe the slope or angle of the roof. This forms an angle of 18 5 between the horizontal section and the roof and creates a gentle incline that is seen as a midpoint between a low pitch and medium pitch roof. The most commonly used roof pitches fall in a range between 4 12 and 9 12.

The tilt angle of the solar array is taken into consideration when the system is being designed.