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Enclosure of vertical shafts shall be in accordance with Sections 1011.8.1 through 1011.8.4.
1011.8.1 Minimum Requirements
Vertical shafts shall be designed to meet the International Building Code requirements for atriums or the requirements of this section.
1011.8.2 Stairways
Where a change of occupancy classification is made to a higher-hazard category as shown in Table 1011.5, interior stairways shall be enclosed as required by the International Building Code.
Exceptions:
  1. In other than Group I occupancies, an enclosure shall not be required for openings serving only one adjacent floor and that are not connected with corridors or stairways serving other floors.
  2. Unenclosed existing stairways need not be enclosed in a continuous vertical shaft if each story is separated from other stories by 1-hour fire-resistance-rated construction or approved wired glass set in steel frames and all exit corridors are sprinklered. The openings between the corridor and the occupant space shall have not fewer than one sprinkler head above the openings on the tenant side. The sprinkler system shall be permitted to be supplied from the domestic water-supply systems, provided that the system is of adequate pressure, capacity and sizing for the combined domestic and sprinkler requirements.
  3. Existing penetrations of stairway enclosures shall be accepted if they are protected in accordance with the International Building Code.
1011.8.3 Other Vertical Shafts
Interior vertical shafts other than stairways, including but not limited to elevator hoistways and service and utility shafts, shall be enclosed as required by the International Building Code where there is a change of use to a higher-hazard category as specified in Table 1011.5.
Exceptions:
  1. Existing 1-hour interior shaft enclosures shall be accepted where a higher rating is required.
  2. Vertical openings, other than stairways, in buildings of other than Group I occupancy and connecting less than six stories shall not be required to be enclosed if the entire building is provided with an approved automatic sprinkler system.
1011.8.4 Openings
Openings into existing vertical shaft enclosures shall be protected by fire assemblies having a fire protection rating of not less than 1 hour and shall be maintained self-closing or shall be automatic-closing by actuation of a smoke detector. Other openings shall be fire protected in an approved manner. Existing fusible link-type automatic door-closing devices shall be permitted in all shafts except stairways if the fusible link rating does not exceed 135°F (57°C).

Related Code Sections

1011.8.1 Change of Occupancy, Minimum Requirements
Vertical shafts shall be designed to meet the International Building Code requirements for atriums or the requirements of this section ...
1011.7.2 Change of Occupancy, Stairways
not be enclosed in a continuous vertical shaft if each story is separated from other stories by 1-hour fire-resistance-rated construction or approved wired ...
1011.8.2 Change of Occupancy, Stairways
not be enclosed in a continuous vertical shaft if each story is separated from other stories by 1-hour fire-resistance-rated construction or approved wired glass ...