Roof Slope Ratio Chart
Pitch rise run 1 5 6 25.
Roof slope ratio chart. 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. Calculate the rafter length substituting these values into the following formula. If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks. Valley hip factor.
Download the slope chart pdf. 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. Notes to the table above. Roof pitch refers to the measurement of the slope of a roof and you express this as a ratio.
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. Some sources consider low slope to include 3 12 pitch roofs. Measure the rise of your roof.
Rafter rise run 1 5 6 2 25 36 38 25rafter 38 25 6 18 m. Let s say it is equal to 1 5 m.