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.

Pitch roof ratios. This is the slope of geometry stairways and other construction disciplines or the trigonometric arctangent function of its decimal. Roof pitch refers to the slope which the rafter creates. A roof with a 6 rise for every 12 run has a 6 per foot or 6 in 12 pitch. 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.

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. 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. Often you express roof pitch as the ratio between the rise and the run in the form of x 12. For example a pitch 1 12 means that per every twelve yards.

The pitch of a roof is its vertical rise over its horizontal span. The slope ratio represents a certain amount of vertical rise for every 12 inches of horizontal run. Sometimes pitch is also expressed in fraction form using a fraction. Roof pitch is often expressed as a ratio between rise and run in the form of x 12.

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. Roof pitch is simply the slope created by the rafter.