Roof Slope Ratio Chart

Roof pitch refers to the measurement of the slope of a roof and you express this as a ratio. Calculate the rafter length substituting these values into the following formula. This is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares.

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Pitch rise run 1 5 6 25.

Roof slope ratio chart.

Let s say it is equal to 1 5 m. If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks. Notes to the table above. 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.

Measure the rise of your roof. Some sources consider low slope to include 3 12 pitch roofs. Download the slope chart pdf. Valley hip factor.

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. Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m. 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. 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.

Low slope roofs are from 0 to 3 12 in pitch. Calculate the roof pitch as the proportion of rise and run.

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