Pitch Roof Ratios

Roof pitch is often expressed as a ratio between rise and run in the form of x 12.

Pitch roof ratios. A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope. Roof pitch refers to the slope which the rafter creates. Often you express roof pitch as the ratio between the rise and the run in the form of x 12. Roof pitch is used to describe the slope or angle of the roof.

Roof pitch is simply the slope created by the rafter. The pitch of a roof is its vertical rise over its horizontal span. A ratio of 1 1 62 is known as the golden ratio and therefore the vast majority of roof pitch in degrees charts you see will be working to this ratio at the very least. Pitch is thus the ratio of the rise in inches to a 12 inch run and is often expressed using a semicolon for example 6 12.

Sometimes pitch is also expressed in fraction form using a fraction. A roof with a 6 rise for every 12 run has a 6 per foot or 6 in 12 pitch. This is the slope of geometry stairways and other construction disciplines or the trigonometric arctangent function of its decimal. The slope ratio represents a certain amount of vertical rise for every 12 inches of horizontal run.

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. You can assess this in two ways either as the roof pitch angles which the rafters make with the horizontal or the proportion between the run and the rise of the roof.