Usual Roof Pitch

Roof pitch varies depending on culture climate style and available materials.

Usual roof pitch.

Usually average roof pitch is determined using the same roof length method. So you would need to pick the right option as most regular standing seam metal roofs will require a roof pitch of 2 12 or even 3 12 at a minimum. Commonly it is 3 4 th of span as per gothic rafter must be equal to span. Express roof pitch as the ratio of the amount of the vertical rise of a roof or rise over the corresponding horizontal distance or run you write the pitch assuming a run of 12 inches thus the ratio would describe how much a roof rises for each foot of the run.

Pitches above 9 12 are very highly angled and are designated steep slope roofs. As aforementioned there is no standard pitch of a roof. In the uk the typical house has a pitch between 40 50 although 45 should be avoided. In the usa the range of standard pitches is anywhere between 4 12 and 9 12.

Pitches lower than 4 12 have a slight angle and they are defined as low slope roofs. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. Pitches of less than 2 12 are considered flat roofs even though they may be very slightly angled. 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.

You could also opt for a pvc flat roofing membrane. There are some standing seam metal roofing options available from atas and other manufacturers that can be installed on a roof with pitch of 1 12.