SECTION 508 MIXED USE AND
OCCUPANCY.
508.2 Incidental uses.
Incidental use areas shall comply with the provisions of this
section.
Exception: Incidental
use areas within and serving a dwelling unit are not required
to comply with this section.
508.2.1 Occupancy classification.
An incidental use area shall be classified in accordance
with the occupancy of that portion of the building in which
it is located or the building shall be classified as a mixed
occupancy and shall comply with Section
508.3.
508.2.2 Separation.
Incidental use areas shall be separated or protected, or
both, in accordance with Table
508.2.
508.2.2.1 Construction.
Where Table 508.2 requires
a fire-resistance-rated separation, the incidental use area
shall be separated from the remainder of the building by
a fire barrier constructed in accordance with Section
706 or a horizontal assembly constructed in accordance
with Section 711, or both. Where Table
508.2 permits an automatic fire-extinguishing system
without a fire barrier, the incidental use area shall be
separated from the remainder of the building by construction
capable of resisting the passage of smoke. The partitions
shall extend from the floor to the underside of the fire-resistance-rated
floor/ceiling assembly or fire-resistance-rated roof/ceiling
assembly above or to the underside of the floor or roof
sheathing, or sub deck above. Doors shall be self- or automatic
closing upon detection of smoke. Doors shall not have air
transfer openings and shall not be undercut in excess of
the clearance permitted in accordance with NFPA 80.
508.2.3 Protection.
Where an automatic fire-extinguishing system or an automatic
sprinkler system is provided in accordance with Table
508.2, only the incidental use areas need be equipped
with such a system.
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