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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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