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NYC Building Code

§ 1011.7.3 — § 1011.7.3

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What is NYC BC § 1011.7.3?

Quick Answer

This section mandates that walls and soffits within enclosed usable spaces under stairways must have a fire-resistance rating of at least one hour or match the stairway enclosure's rating, whichever is higher. It specifies that access to these spaces cannot be directly from the stairway enclosure, with an exception for certain residential units. Applies to building owners managing stairway enclosures.

General informational summary. Not legal advice for your situation. Consult an attorney before acting on any specific matter.

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1011.7.3 Enclosures under interior stairways.

BC § 1011.7.3

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.

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