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Guide to the ADA Standards

Treads and Riser Specifications in the ADA Standards (§504)

Stairs with treads 11” deep min. and risers 4” – 7” high. Note: All steps on a flight must have uniform riser heights and uniform tread depths. Open risers are prohibited.

Nosing Specifications

Nosing details show: tread edge radius ½” max; angled riser nosing 30 degrees max from vertical; and curved or beveled nosing 1 ½” max. projection (IBC: 1 ¼” max).

Source: Guide to the ADA Standards by U.S. Access Board - published 02/2014

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