Roof Slope Ratio Chart

If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks.

Roof slope ratio chart.

Valley hip factor. Some sources consider low slope to include 3 12 pitch roofs. Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m. Download the slope chart pdf.

Low slope roofs are from 0 to 3 12 in pitch. Pitch rise run 1 5 6 25. Let s say it is equal to 1 5 m. This is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares.

Although there s isn t any standard pitch of a roof used on all kinds of sloped roofs you can determine the range of pitches by using a roof angle calculator and by considering factors like the local climate and roofing materials. A ratio of 1 1 62 is known as the golden ratio and therefore the vast majority of roof pitch in degrees charts you see will be working to this ratio at the very least. Notes to the table above. Measure the rise of your roof.

Calculate the roof pitch as the proportion of rise and run. Roof pitch refers to the measurement of the slope of a roof and you express this as a ratio.