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NYC Building Code

§ 1011.10 — § 1011.10

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What is NYC BC § 1011.10?

Quick Answer

This section outlines the regulations for spiral stairways used as a means of egress, permitting their use in dwelling units or small spaces serving up to five occupants. It specifies minimum dimensions for tread depth, riser height, headroom, and clear width. Applies to building owners designing egress systems.

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

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1011.10 Spiral stairways.

BC § 1011.10

Spiral stairways are permitted to be used as a component in the means of egress only within dwelling units or from a space not more than 250 square feet (23.2 m 2 ) in area and serving not more than five occupants, or from technical production areas in accordance with Section 410.6. A spiral stairway shall have a 7 1/2-inch (190.5 mm) minimum clear tread depth at a point 12 inches (304.8 mm) from the narrow edge. The risers shall be sufficient to provide a headroom of 78 inches (1981.2 mm) minimum, but riser height shall not be more than 9 1/2 inches (241.3 mm). The minimum stairway clear width at and below the handrail shall be 26 inches (660.4 mm).

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