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.

Is a roof pitch of 11 12 allowed.

This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. Normal roof slope for typical installation. 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. Roof slope equivalents as rise. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. Normal shingle installation is allowed for all roofs with a pitch of 4 12 and above.

If this isn t practical then perform the same measurement on the underside of. The following table provides the minimum required. Most roof s have a pitch in the 4 12 to 9 12 range. If a roof rises 11 in a length of 12 this is 11 12 roof pitch.

Two most common methods 4 12 or 4 12 are used for marking the pitch of a roof. 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. 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. Divide the results by the number of 12 inch segments in your level.

The combination of two numbers are used to display or show the roof pitch. As aforementioned there is no standard pitch of a roof. 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 can also estimate a roof pitch by eyeballing it from the ground from the gable side with a level and ruler.

The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. Asphalt shingles continue to be the most widely installed roof covering option in north america.