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1011.7.3 Enclosures Under Interior Stairways
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The walls and soffits within enclosed usable spaces under enclosed and unenclosed stairways shall be protected by 1-hour fire-resistance-rated construction or the fire-resistance rating of the stairway enclosure, whichever is greater. Access to the enclosed space shall not be directly from within the stairway enclosure.
Exception: Spaces under stairways serving and contained within a single residential dwelling unit in Group R-2 or R-3 shall be permitted to be protected on the enclosed side with 1/2-inch (12.7 mm) gypsum board.
Related Code Sections
1011.7.3 Means of Egress, Enclosures Under Interior Stairways
within the stairway enclosure. Exception: Spaces under stairways serving and contained within a single residential dwelling unit in Group R-2 ...
Building Code 2018 of Illinois > 10 Means of Egress > 1011 Stairways > 1011.7 Stairway Construction > 1011.7.3 Enclosures Under Interior Stairways
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(87 Pa) in the shaft relative to the building measured with all interior exit stairway and ramp doors closed under maximum anticipated conditions ...
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Where required by Section 403.5.4, 405.7.2 or 412.2.2.1, interior exit stairways and ramps shall be smokeproof enclosures in accordance ...
Building Code 2018 of Illinois > 10 Means of Egress > 1023 Interior Exit Stairways and Ramps > 1023.11 Smokeproof Enclosures
1011.7.2 Change of Occupancy, Stairways
Where a change of occupancy classification is made to a higher-hazard category as shown in Table 1011.4, interior stairways shall be enclosed ...
Existing Building Code 2018 of Illinois > 10 Change of Occupancy > 1011 Change of Occupancy Classification > 1011.7 Enclosure of Vertical Shafts > 1011.7.2 Stairways
403.5.4 Special Detailed Requirements Based on Occupancy and Use, Smokeproof Enclosures
Every required interior exit stairway serving floors more than 75 feet (22 860 mm) above the lowest level of fire department vehicle access shall ...
Building Code 2018 of Illinois > 4 Special Detailed Requirements Based on Occupancy and Use > 403 High-Rise Buildings > 403.5 Means of Egress and Evacuation > 403.5.4 Smokeproof Enclosures