Is A Roof Pitch Of 11 12 Allowed

As aforementioned there is no standard pitch of a roof.

Is a roof pitch of 11 12 allowed.

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. Asphalt shingles continue to be the most widely installed roof covering option in north america. Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.

Divide the results by the number of 12 inch segments in your level. Roof slope equivalents as rise. Normal roof slope for typical installation. 11 12 roof pitch angle 42 51 degrees.

The following table provides the minimum required. The table below shows common roof pitches and the equivalent grade degrees and radians for each. Most roof s have a pitch in the 4 12 to 9 12 range. If 4 12 and above is normal and 2 12 is minimum what about properties with roofs in between the two such as a 3 12 pitched roof.

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. For example if you used a 24 inch level and your measurement was 12 inches the pitch in your roof is 6 in 12. You can also estimate a roof pitch by eyeballing it from the ground from the gable side with a level and ruler. Low sloped roof shingle installation.

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. If this isn t practical then perform the same measurement on the underside of. Run in degrees and as percentage the minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. 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.

They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles.