Roof Pitch Off By Inches

A 4 12 is a roof slope that rises by 4 inches for every 12 inches across.

Roof pitch off by inches.

However you can only use this pitch with built up roofing or specialized synthetic roofing. You can also estimate a roof pitch by eyeballing it from the ground from the gable side with a level and ruler. For example if you used a 24 inch level and your measurement was 12 inches the pitch in your roof is 6 in 12. 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.

Divide the results by the number of 12 inch segments in your level. A roof with a 6 rise for every 12 run has a 6. 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 roof pitch is important in determining the appropriate installation method and how much roofing material will be needed.

This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. 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.