Roof Run Definition

Definition of roof slope.

Roof run definition.

Originating in gothic architecture this is a water spout for roof run off. This is the slope of geometry stairways and other construction disciplines or the trigonometric arctangent function of its decimal. Runoff definition something that drains or flows off as rain that flows off from the land in streams. 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.

For english units of measurement when dimensions are given in inches slope may be expressed as a ratio of rise to run such as 4 12 or as a percent. 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. The angle a roof surface makes with the horizontal expressed as a ratio of the units of vertical rise to the units of horizontal length sometimes referred to as run. The same roof has a 4 12 or 1 3 pitch.

This table lists all of the common roof slopes expressed as rise run roof angle roof slope slope grade and walk ability. 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. For example a pitch 1 12 means that per every twelve yards. Roof pitch is simply the slope created by the rafter.

Slope a roof s slope is the number of inches it rises for every 12 inches of horizontal run a roof with a 4 in 12 slope rises 4 inches for every 12 inches of horizontal run. Roof pitch is often expressed as a ratio between rise and run in the form of x 12. Roof slope can also be described as the angle of change in elevation expressed in one of several forms. The characteristics of a roof are dependent upon the purpose of the building that it covers the available roofing.

A roof is part of the building envelope. Roof pitch roof pitch refers to the amount of rise a roof has compared to the horizontal measurement of the roof called the run. The pitch of a roof is its vertical rise over its horizontal span. Roof run the horizontal distance from the outside of a bearing wall plate to the center of the ridge rafter.

To see how pitch impacts the look of a garage and changes cost click the design center button on our pole barn kits page. Roof span equal to twice the roof run or the horizontal distance between the outside faces of bearing wall plates.