Finding Slope Of A Roof

In civil engineering the slope is the numerical measure of the steepness of a roof.

Finding slope of a roof.

The example to right shows 2 different ways to determine or calculate roof pitch also called roof slope. Some sources consider low slope to include 3 12 pitch roofs. If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks. For example if you find 4 inches of height with the tape measure at the 12 inch mark on the level your slope is 4 12 or 4 in 12.

You need to consider the slope requirements of each panel to determine this minimum slope. 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. 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. The slope of your roof is the ratio of vertical distance rise to horizontal distance run.

Low slope roofs are from 0 to 3 12 in pitch. The 7 means that the roof rises 7 for every 12 it runs. Express the slope of a metal roof by a ratio which indicates the pitch of the roof. This forms an angle of 18 5 between the horizontal section and the roof and creates a gentle incline that is seen as a midpoint between a low pitch and medium pitch roof.

The slope of your roof is determined by the vertical rise in inches for every horizontal twelve inch 12 length called the run. The minimum slope of a roof depends on the roof s profile. By slope angle formula steepness can be obtained by dividing vertical rise by horizontal span. Angle the angle of a roof is the same as the roof s slope except instead of being.

Just write down the measurements you found. Notes to the table above. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. It is expressed with the rise mentioned first and the run mentioned second.

Example a the measurements are taken from on top of the roof. There s no need to simplify them. If this isn t practical then perform the same measurement on the underside of. Simply mark a level at 12 hold it perfectly level and measure from the roof surface to your 12 mark this.

Roof pitch calculator results explained. For instance if your roof has a four inch 4 rise for every horizontal foot then it has a 4 in 12 slope or pitch. The profile is the shape taken by the sheets when you bend them to form panels.