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1009.7 Circular Stairways
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Circular stairways shall have a minimum tread depth and a maximum riser height in accordance with Section 1009.3 and the smaller radius shall not be less than twice the width of the stairway. The minimum tread depth measured 12 inches (305 mm) from the narrower end of the tread shall not be less than 11 inches (279 mm). The minimum tread depth at the narrow end shall not be less than 10 inches (254 mm).
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NYC Building Code 2008 > 10 Means of Egress > 1009 Stairways and Handrails > 1009.7 Circular Stairways
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