For Roof Slopes From 2 12 To 4 12

If a roof slope rises say 4 inches when measured 12 inches along the bottom of a horizontal roof truss the roof slope is said to be 4 12.

For roof slopes from 2 12 to 4 12.

Most roof s have a pitch in the 4 12 to 9 12 range. The table below shows common roof pitches and the equivalent grade degrees and radians for each. 8 2 5 inches in 12. The picture below shows the pitch of a 7 12 roof slope meaning that for 12 of horizontal measurement roof run the vertical measurement roof rise is 7.

For a slope of 55 55 divided by 100 0 55. Roof pitch is a term describing how steep or flat your roof slope is. If this isn t practical then perform the same measurement on the underside of. This will give you the rise over run or pitch.

The combination of two numbers are used to display or show the roof pitch. Divide the percentage number by 100. For a slope of 35 tan 35 0 700. A pitch over 9 12 is considered a steep slope roof between 2 12 and 4 12 is considered a low slope roof and less than 2 12 is considered a flat roof.

Simply locate a roof rafter board place the end of the level against the bottom edge and measure from the 12 inch mark vertically to the bottom edge of the rafter. 55 slope is equal to a slope of 28 81. I e 4 inches of rise per 12 inches one foot of run. Find the arctangent of the resulting value.

This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. Roof slopes are most commonly defined by the rise over run ratio. Giving you a slope of 8 4 in 12 or.