How To Look At A House
McGarry and Madsen's home inspection blog for buyers of
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What is the minimum slope of a flat roof?
Wednesday, October 9, 2019
Minimum slope is 1/4” vertically per foot (12”) horizontally, according to both the International Residential Code (IRC) and the Residential Edition of the Florida Building Code (FBC). This is equivalent to a 2% slope. Roofs that are often called “flat” are actually very low slope, to promote water runoff and avoid standing water, which is called “ponding.” To learn more, see our blog post What is "ponding" on a flat roof?
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Here’s links to a collection of our blog posts about “FLAT ROOFS (LOW SLOPE)":
• What causes bubble-like blisters in a built-up and gravel roof?
• Why does it cost so much more to replace a steep roof than a low slope roof?
• What is "ponding" on a flat roof?
• Why is there no attic access hatch in the house?
• What is the difference between roll roofing and modified bitumen?
• What is the purpose of the gravel on a flat tar roof?
• Can metal roofing be used on a low slope/pitch roof?
• Does a gravel roof need maintenance?
• What is the average lifespan of a built-up and gravel roof?
• What is the average lifespan of a modified bitumen roof?
• What is the average life expectancy of a TPO (Thermoplastic PolyOlefin) roof?
• • I'm buying a '50s modern house with a "gravel" roof. Is the roof going to be a problem?
Visit our ROOF AND ATTIC page for other related blog posts on this subject, or go to the INDEX for a complete listing of all our articles.
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