Slope Of A Roof Definition

The slope of a roof is often referred to as the pitch.

Slope of a roof definition.

This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. The pitch of a roof is its vertical rise over its horizontal span. However most often a ratio of pitch also fraction is slang used for the more useful slope of rise over run of just one side half the span of a dual pitched roof. A roof with x rise 12 run slope means that for every 12 inches horizontally run it rises x inches.

The slope or pitch of the roof is determined by the vertical rise in inches for every horizontal twelve inch 12 length called the run. By slope angle formula steepness can be obtained by dividing vertical rise by horizontal span. Slopes greater than 18 12 are found on a frame roofs and some mansard style roofs. The numbers in the table above can be calculated as follows.

In the imperial unit of measurements the slope is expressed with the rise and run. Roof slope is the amount of vertical change in height as a ratio of horizontal distance traveled also expressed as inches of rise per foot of horizontal run or cm of rise per m of horizontal run. And as illustrated below for a 12 inch unit length roof we calculate the hypotenuse dimension to obtain the roof true width for each roof slope. Roof slope can also be described as the angle of change in elevation expressed in one of several forms.

Clearly once we get near 90 we re describing a wall not a roof that is vertical or near vertical surface. The slope of a roof can be defined as the measurement of the rise of the roof to the base of the roof from the center which is essentially called the run of the roof. A roof with one slope historically attached to a taller wall. 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.

Mono pitched roof shed skillion lean to roof. Roofers express roof slope as rise or pitch measured in inches of vertical rise per foot of horizontal distance or run. Also see roof architectural styles 3. It is computed by using the simple roof slope formula.

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