435.5 Fire-Resistance-Rated Construction Provisions
Group R-2.1 and R-4 occupancies licensed as a Residential Care Facility (RCF) with individual floor areas over 6000 square feet (557 m2) per floor, shall be provided with smoke barriers, constructed in accordance with Section 710 of the California Building Code.
When smoke barriers are required, the area within a smoke compartment shall not exceed 22,500 square feet (2090 m2) nor shall its travel distance exceed 200 feet (60 960 mm). Such smoke barriers shall divide the floor as equally as possible.
Group R-2.1 occupancies where smoke partitions are required, framing shall be covered with noncombustible materials having an approved thermal barrier with an index of not less than 15 in accordance with FM 4880, UL 1040, NFPA 286 or UL 1715.