When is a three story residential occupancy not required to be equipped with an NFPA 13D sprinkler system (per section R317.3)?
A. It is not required to be equipped with an NFPA 13D sprinkler system when the first of the three stories is a basement. RC section R202.1 defines the term basement as that portion of a building that is partly or completely below grade. Sprinklers are not required in any building having two stories above a basement, whether the basement is below grade or considered a story above grade. It should be noted that an attic is defined as an unfinished space. A two-story building with an attic converted to a finished space is a three story building and must be sprinklered in accordance with NFPA 13D.
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