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Note: This document or portion of document references a state or local code that is stricter than the 2010 ADA Standards requires.

11B-504.2 Treads and risers.

All steps on a flight of stairs shall have uniform riser heights and uniform tread depths. Risers shall be 4 inches (102 mm) high minimum and 7 inches (178 mm) high maximum. Treads shall be 11 inches (279 mm) deep minimum. 

Exception: Curved stairways with winder treads are permitted at stairs which are not part of a required means of egress.


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