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Curved stairways with winder treads shall have treads and risers in accordance with Section 1011.5 and the smallest radius shall be not less than twice the minimum width or required capacity of the stairway.
Exception: The radius restriction shall not apply to curved stairways in Group R-3 and within individual dwelling units in Group R-2.

Related Code Sections

1011.9 Means of Egress, Curved Stairways
Curved stairways with winder treads shall have treads and risers in accordance with Section 1011.5 and the smallest radius shall be not less than ...
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Curved stairways with winder treads shall have treads and risers in accordance with Section 1011.5 and the smallest radius shall be not less than ...
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in means of egress stairways except within a dwelling unit. Exceptions: Curved stairways in accordance with Section 1011.9. Spiral stairways ...