Pitch Roof Ratios

Roof pitch refers to the slope which the rafter creates.

Pitch roof ratios.

A a roof with a 6 rise for every 12 run has a 6 per foot or 6 in 12 pitch. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. 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. A ratio of 1 1 62 is known as the golden ratio and therefore the vast majority of roof.

Pitch is the incline of the roof represented as the ratio of rise to the span twice the run. Pitch is written assuming a run of a foot or 12 inches so the ratio describes how much the roof rises for every foot of its 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. 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.

Often you express roof pitch as the ratio between the rise and the run in the form of x 12. Roof pitch or slope is a measure of vertical rise to horizontal run expressed in inches per foot. Roof pitch is simply the slope created by the rafter. The slope ratio represents a certain amount of vertical rise for every 12 inches of horizontal run.

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. So the pitch of a roof is determined by how many inches the slope rises for every 12 inches it runs horizontally. It can be assessed in two ways either as the angle the rafter makes with the horizontal or the proportion between the rise and the run of the roof. For example if the roof rises 4 feet and the span is 16 feet twice the run then the pitch is 4 16 or 1 4.

Roof pitch is often expressed as a ratio between rise and run in the form of x 12. If a roof increases in height by four inches for every foot of horizontal run it is considered to have a 4 in 12 pitch or just a 4 pitch talk in terms of pitches and you will always be understood in the roofing universe. The same pitch is also sometimes written as 4 12 4 in 12 or 4 over 12. A roof that rises 4 inches for every 1 foot or 12 inches of run is said to have a 4 in 12 slope.

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.