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What is code for the fire rating for a garage ceiling?
Monday, July 27, 2020
Most attached garages have a ceiling secured to the bottom chord of the roof trusses or ceiling rafters, and the ceiling must minimum be 1/2” drywall or equivalent. If there is no ceiling and the roof structure is exposed in the garage, then the wall separating the garage from the dwelling must be 1/2” drywall or equivalent and extend up to the underside of the roof sheathing. Any attic access opening panels must also be 1/2” drywall or equivalent. These requirements do not apply to detached garages. When there is a living area (habitable space) above the garage, including at a detached garage, the ceiling requirement ramps up to 5/8” Type X fire-rated drywall.
This is part of multiple requirements for “Dwelling-Garage Separation” for an attached garage in the International Residential Code (IRC) and the Residential Edition of the Florida Building Code (FBC). While not called a “fire rating,” the specs are intended to create a fire barrier to reduce the spread of a fire from an attached garage to the living area of a home. To learn about the other garage fire separation requirements, go to our blog post What are the code requirements for fire separation between an attached garage and the house?
Here’s links to a collection of some of our other blog posts about GARAGES AND CARPORTS:
• What are the common problems when a homeowner converts a garage to conditioned living space, such as a family room?
• What are the code requirements for fire separation between an attached garage and the house?
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