Finding Slope Of A Roof

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.

Finding slope of a roof.

You need to consider the slope requirements of each panel to determine this minimum slope. In civil engineering the slope is the numerical measure of the steepness of a roof. The 7 means that the roof rises 7 for every 12 it runs. 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.

Example a the measurements are taken from on top of the roof. Notes to the table above. Roof pitch calculator results explained. Low slope roofs are from 0 to 3 12 in pitch.

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. By slope angle formula steepness can be obtained by dividing vertical rise by horizontal span. If asphalt shingles are to be installed on a low slope roof special steps are required to avoid short roof life and roof leaks.

If this isn t practical then perform the same measurement on the underside of. Angle the angle of a roof is the same as the roof s slope except instead of being. The slope of your roof is determined by the vertical rise in inches for every horizontal twelve inch 12 length called the run. There s no need to simplify them.

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. The example to right shows 2 different ways to determine or calculate roof pitch also called roof slope. The slope of your roof is the ratio of vertical distance rise to horizontal distance run. A 4 12 is a roof slope that rises by 4 inches for every 12 inches across.

In the imperial unit of measurements the slope is expressed with the rise and run. The minimum slope of a roof depends on the roof s profile. 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. Simply mark a level at 12 hold it perfectly level and measure from the roof surface to your 12 mark this.

Some sources consider low slope to include 3 12 pitch roofs. The profile is the shape taken by the sheets when you bend them to form panels. Express the slope of a metal roof by a ratio which indicates the pitch of the roof.