The 2012 Seattle Building Code Interpretation, 714.4 Penetrations of Horizontal Assemblies is now available. It is an update of Code Alternate CA 713.4, which was last available in the 2009 edition of the Seattle Building Code. The interpretation clarifies how to protect penetrations of horizontal fire-resistance-rated assemblies by items such as recessed lighting, ceiling exhaust fans or diffusers, and associated ductwork. It Includes tables and standard details that may be used for conventional framing, plywood web joists, and metal plate connected wood trusses.
In other words, this new interpretation clarifies how to properly install a ceiling fan or a recessed light so that the ceiling remains fire-resistant.
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