// CODE SNIPPET
504 Stairways
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Stairs shall comply with 504.
All steps on a flight of stairs shall have uniform riser heights and uniform tread depths. Risers shall be 4 inches (100 mm) high minimum and 7 inches (180 mm) high maximum. Treads shall be 11 inches (280 mm) deep minimum.
Open risers are not permitted.
Stair treads shall comply with 302. Changes in level are not permitted.
EXCEPTION: Treads shall be permitted to have a slope not steeper than 1:48.
Advisory 504.4 Tread Surface. Consider providing visual contrast on tread nosings, or at the leading edges of treads without nosings, so that stair treads are more visible for people with low vision.
The radius of curvature at the leading edge of the tread shall be 1/2 inch (13 mm) maximum. Nosings that project beyond risers shall have the underside of the leading edge curved or beveled. Risers shall be permitted to slope under the tread at an angle of 30 degrees maximum from vertical. The permitted projection of the nosing shall extend 11/2 (38 mm) maximum over the tread below.
Stairs shall have handrails complying with 505.
Stair treads and landings subject to wet conditions shall be designed to prevent the accumulation of water.
Related Code Sections
210 Scoping Requirements, Stairways
Interior and exterior stairs that are part of a means of egress shall comply with 504.
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At the top of a stair flight, handrails shall extend horizontally above the landing for 12 inches (305 mm) minimum beginning directly above the first ...
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2010 ADA Standards > 2 Scoping Requirements > 206 Accessible Routes > 206.2 Where Required > 206.2.3 Multi-Story Buildings and Facilities > 206.2.3.1 Stairs and Escalators in Existing Buildings