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What is the code requirement for fire separation in an attic between sides of a duplex?
Tuesday, November 27, 2018
A 1-hour fire rating for the wall separating the units, which is usually 5/8” Type-X drywall, is required. It must extend from foundation to underside of roof sheathing. Here’s how it is specified in the Residential Edition of the Florida Building Code (FBC) and the International Residential Code (IRC).
And three exceptions have been added over the years, for a duplex with an automatic sprinkler system, fire-rated ceilings, or a screen enclosure.
One thing is for sure, though: the duplex shown above predates this code requirement. Also, see our blog post When was a fire separation in the attic first required between sides of a duplex?
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