2 Inch Per Foot Roof Slope

Roof pitch or slope is a measure of vertical rise to horizontal run expressed in inches per foot.

2 inch per foot roof slope.

I e 4 inches of rise per 12 inches one foot of run. Roof pitch calculator results explained. However roof pitch is technically measured and defined differently. The slope ratio represents a certain amount of vertical rise for every 12 inches of horizontal run.

A 12 12 roof pitch would be selected as 12 inches of rise per foot with no fraction and the value generated by the calculator would be 45º. However you can only use this pitch with built up roofing or specialized synthetic roofing. The triangle diagram will be re drawn to scale with all dimensions marked. 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.

This is the basis for calculating the angle which is approximately a 1 19 degree slope. If the rise is 6 inches for every 12 inches of run then the roof slope is 6 in 12 the slope can be expressed numerically as a ratio. A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope. Feet inches enter run the flat level length then click pitch angle or rise to select then enter other known dimension angle or pitch.

Note that roof pitch is sometimes used in parallel with roof slope. According to the international building code the typical built up flat roof that uses tar or asphalt goes by the guideline that for every foot 12 inches of a flat roof a minimum of inch must step up or down. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run. Strangely enough if a pitch of 6 inches rise per foot is entered then the degrees generated is not 22 5º it is 26 6º.

A roof with a 6 rise for every 12 run has a 6 per foot or 6 in 12 pitch. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. 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 this is very useful information for many purposes especially for roof framing the slope sometimes called pitch is calibrated on speed squares. Slope conversion tables 1 4 1 2 3 4 1 1 1 4 1 1 2 1 3 4 2 2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 0 25 0 50 0 75 1 00 1 25 1 50 1 75 2 00 2 25 3 4 5 6 7 8 9 10.