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508.2.5 Separation of Incidental Accessory Occupancies
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The incidental accessory occupancies listed in Table 508.2.5 shall be separated from the remainder of the building or equipped with an automatic fire-extinguishing system, or both, in accordance with Table 508.2.5.
Exception: Incidental accessory occupancies within and serving a dwelling unit are not required to comply with this section.
| ROOM OR AREA | SEPARATION AND/OR PROTECTION |
| Furnace room where any piece of equipment is over 400,000 Btu per hour input | 1 hour or provide automatic fire-extinguishing system |
| Rooms with boilers where the largest piece of equipment is over 15 psi and 10 horsepower | 1 hour or provide automatic fire-extinguishing system |
| Refrigerant machinery room | 1 hour or provide automatic sprinkler system |
| Hydrogen cutoff rooms, not classified as Group H | 1 hour in Group B, F, M, S and U occupancies; 2 hours in Group A, E, I and R occupancies. |
| Incinerator rooms | 2 hours and automatic sprinkler system |
| Paint shops, not classified as Group H, located in occupancies other than Group F | 2 hours; or 1 hour and provide automatic fire-extinguishing system |
| Laboratories and vocational shops, not classified as Group H, located in a Group E or I-2 occupancy | 1 hour or provide automatic fire-extinguishing system |
| Laundry rooms over 100 square feet | 1 hour or provide automatic fire-extinguishing system |
| Group I-3 cells equipped with padded surfaces | 1 hour |
| Group I-2 waste and linen collection rooms | 1 hour |
| Waste and linen collection rooms over 100 square feet | 1 hour or provide automatic fire-extinguishing system |
| Stationary storage battery systems having a liquid electrolyte capacity of more than 50 gallons, or a lithium-ion capacity of 1,000 pounds used for facility standby power, emergency power or uninterrupted power supplies | 1 hour in Group B, F, M, S and U occupancies; 2 hours in Group A, E, I and R occupancies. |
| Rooms containing fire pumps in nonhigh-rise buildings | 2 hours; or 1 hour and provide automatic sprinkler system throughout the building |
| Rooms containing fire pumps in high-rise buildings | 2 hours |
For SI: 1 square foot = 0.0929 m2, 1 pound per square inch (psi) = 6.9 kPa, 1 British thermal unit (Btu) per hour = 0.293 watts, 1 horsepower = 746 watts, 1 gallon = 3.785 L.
508.2.5.1 Fire-Resistance-Rated Separation
Where Table 508.2.5 specifies a fire-resistance-rated separation, the incidental accessory occupancies shall be separated from the remainder of the building by a fire barrier constructed in accordance with Section 707 or a horizontal assembly constructed in accordance with Section 712, or both. Construction supporting 1-hour fire-resistance-rated fire barriers or horizontal assemblies used for incidental accessory occupancy separations in buildings of Type IIB, IIIB and VB construction are not required to be fire-resistance rated unless required by other sections of this code.
508.2.5.2 Nonfire-Resistance-Rated Separation and Protection
Where Table 508.2.5 permits an automatic fire-extinguishing system without a fire barrier, the incidental accessory occupancies shall be separated from the remainder of the building by construction capable of resisting the passage of smoke. The walls shall extend from the top of the foundation or floor assembly below to the underside of the ceiling that is a component of a fire-resistance-rated floor assembly or roof assembly above or to the underside of the floor or roof sheathing, deck or slab above. Doors shall be self- or automatic- closing upon detection of smoke in accordance with Section 715.4.8.3. Doors shall not have air transfer openings and shall not be undercut in excess of the clearance permitted in accordance with NFPA 80. Walls surrounding the incidental accessory occupancy shall not have air transfer openings unless provided with smoke dampers in accordance with Section 711.7.
508.2.5.3 Protection
Except as specified in Table 508.2.5 for certain incidental accessory occupancies, where an automatic fire-extinguishing system or an automatic sprinkler system is provided in accordance with Table 508.2.5, only the space occupied by the incidental accessory occupancy need be equipped with such a system.
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