This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement.
Roof pitch off by inches.
A roof with a 6 rise for every 12 run has a 6.
The roof pitch is important in determining the appropriate installation method and how much roofing material will be needed.
The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.
Roof pitch is used to describe the slope or angle of the roof.
Roof pitch or slope is a measure of vertical rise to horizontal run expressed in inches per foot.
You can also estimate a roof pitch by eyeballing it from the ground from the gable side with a level and ruler.
However you can only use this pitch with built up roofing or specialized synthetic roofing.
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.
Divide the results by the number of 12 inch segments in your level.
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.
A 4 12 is a roof slope that rises by 4 inches for every 12 inches across.