Once you’ve figured out the pitch of your roof, you can consult the following chart to discover the slope factor and hip and valley factor. Calculate the roof pitch as the proportion of rise and run: pitch rise / run 1.5 / 5 0.3. Finding The Slope and Hip and Valley Factor
For example, if you measure 4 inches, the pitch of your roof is 4:12. This will give you the rise over run, or pitch. Simply locate a roof rafter board, place the end of the level against the bottom edge and measure from the 12-inch mark vertically to the bottom edge of the rafter. Then, you’ll be able to measure slope from an unfinished attic space under the roof. Using a tape measure, make a pencil mark 12 inches from the end of a carpenter’s level. To obtain an accurate roof pitch measurement, properly measure the rise and run. In order to know what type of materials will work best for your project and the amount of materials required, you’ll need to find out the pitch of your roof. Pitch is expressed as a ratio of the vertical rise to the horizontal span. That’s why we’re using pitch here-because it’s the industry standard term to talk about the angle or steepness of a roof.When outfitting your residential or commercial structure with roofing materials from Everlast Roofing, Inc., it’s important to know the incline, or pitch, of your roof. You’ll also find roofing contractors and roofing manufacturers using both terms to mean the same thing: rise over run.
And in the end, these differences in how you measure pitch and slope don’t affect the quantity of roofing materials you are ordering.Īs roofs have gotten more complex, the span measurement is less useful because roof calculations needs to take into account different roof sections. You may notice then that what we’ve been referring to as “pitch” throughout this article is technically “slope.” While this can be confusing, pitch is the more common term that you’ll encounter.
While both measurements can be used to calculate roofing materials and determine roof type, they are different calculations. Roof pitch is a measure of how much a roof rises in relation to its span. In other words, roof slope is the angle of a roof’s surface relative to the horizontal plane. What you’ll often see referred to as pitch is technically the slope. Use the diagrams on this page when referring. Here’s the difference: slope is measured as the rise over run, while pitch actually refers to the rise over span (where span is the entire horizontal measurement of the roof, and therefore equals twice the run). The roof pitch calculator calculates rise, run, slope, pitch, angle, and rafter length. You’ll often find the terms “pitch” and “slope” used interchangeably in the roofing industry however, there is a distinction as they refer to two different measurements.
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