How Is Roof Slope Measured

Record these values as roof rise over run with the vertical measurement listed first and the horizontal second.

How is roof slope measured. Roof slope or pitch rise run area and other features. The roof pitch is important in determining the appropriate installation method and how much roofing material will be needed. Roof pitch is used to describe the slope or angle of the roof. Roof slope style.

The use of a 48 inch carpenter s level or a straight 2x4 board may be useful to create a smooth surface that mirrors the slope of the roof. This article shows how simple measurements can give the roof area. 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. Although there s isn t any standard pitch of a roof used on all kinds of sloped roofs you can determine the range of pitches by using a roof angle calculator and by considering factors like the local climate and roofing materials.

Roof pitch refers to the measurement of the slope of a roof and you express this as a ratio. Here we describe various methods for measuring all roof data. That is the roof s rise. The next step is to measure the pitch also referred to as the roof slope of the roof deck.

In the attic place the level against a rafter with the 12 inch mark on the bottom of the rafter. Here s an easy safe way to determine the pitch from inside your attic. Measuring the roof slope from the roof surface will be inaccurate without the use of something to make a flat surface from which to measure the slope. Roof pitch or slope is a measure of vertical rise to horizontal run expressed in inches per foot.

First measure 12 inches from one. Roof slope calculator example of use. Measure from the end of the level up to the bottom edge of the rafter. This is the slope of geometry stairways and other construction disciplines or the trigonometric arctangent function of its decimal.

This distance is the roof s rise. To measure the roof pitch you ll need an 18 or 24 inch level a tape measure and a pencil. You ll need to figure out the vertical distance also known as the rise over a 12 horizontal segment also known as the run. We include on roof measurements roof measurements or estimates that can be made from ground level and several neat tricks using a folding ruler to measure roof angle or slope.

Measure the run length it is the horizontal distance between the roof ridge and the wall of the building. Knowing the pitch of your roof is useful when designing an addition installing skylights or cutting new rake boards. 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. Pitch measurement method 3.