How Is Roof Slope Measured

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.

How is roof slope measured.

Roof pitch is used to describe the slope or angle of the roof. 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. You ll need to figure out the vertical distance also known as the rise over a 12 horizontal segment also known as the run. Roof slope style.

Roof pitch refers to the measurement of the slope of a roof and you express this as a ratio. First measure 12 inches from one. Roof slope calculator example of use. This article shows how simple measurements can give the roof area.

The roof pitch is important in determining the appropriate installation method and how much roofing material will be needed. Record these values as roof rise over run with the vertical measurement listed first and the horizontal second. Roof pitch or slope is a measure of vertical rise to horizontal run expressed in inches per foot. 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.

This distance is the roof s rise. Roof slope or pitch rise run area and other features. 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. To measure the roof pitch you ll need an 18 or 24 inch level a tape measure and a pencil.

Here we describe various methods for measuring all roof data. This measurement is best done on a bare roof because curled up roofing shingles will impair your measurement. In the attic place the level against a rafter with the 12 inch mark on the bottom of the rafter. Measure from the end of the level up to the bottom edge of the rafter.

Here s an easy safe way to determine the pitch from inside your attic. How to measure roof pitch. The next step is to measure the pitch also referred to as the roof slope of the roof deck. This is the slope of geometry stairways and other construction disciplines or the trigonometric arctangent function of its decimal.

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