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What is the minimum pitch/slope for a metal roof?
Sunday, September 9, 2018
The minimum pitch for metal roofing varies depending on the profile of the metal. Profile, in the context of metal roofing, means the shape that the sheet of metal is bent into to form the panels. The pitch is measured in inches of vertical rise per foot of horizontal run, and the “5V-crimp” profile shown above requires a minimum slope of “three in twelve” or 3/12 (3-inches vertically per 12-inches horizontally). “Corrugated” metal roofing has the same minimum pitch.
Profiles with a higher ridge at the panel connections can be installed lower. Also, pitch is often expressed in a shorthand style using just the first number. “PBR,” which is typically used for industrial metal buildings, can be installed as low as half-inch pitch, for example. And profiles like “standing seam,” which utilize a concealed connection to the roof deck, require only a one-and-a-half inch minimum pitch.
Manufacturers specify a minimum pitch for each of the profiles they offer and, sometimes, they can be installed at a lower pitch if special underlayment or installation procedures are followed. For more information about metal roofing, we suggest visiting the website of Gulf Coast Supply and Manufacturing at www.gulfcoastsupply.com.
Also, see our blog post How can I find out the age of a roof?
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To learn more about roofs and attics, see these other blog posts:
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