Roof Slope Ratio Chart

Notes to the table above.

Roof slope ratio chart.

Download the slope chart pdf. Slope the slope of a roof is represented as x 12 where x is the number of inches in rise for every 12 inches of run. Low slope roofs are from 0 to 3 12 in pitch. 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.

Roof pitch refers to the measurement of the slope of a roof and you express this as a ratio. 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. Calculate the rafter length substituting these values into the following formula. Pitch rise run 1 5 6 25.

Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m. This is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares. Measure the rise of your roof. Once you ve figured out the pitch of your roof you can consult the following chart to discover the slope factor and hip valley factor.

If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks. Some sources consider low slope to include 3 12 pitch roofs.