2019 California Standards for Accessible Design Guide (effective January 1, 2020 with July 1, 2021 amendments)
1011.5.2 Riser height and tread depth.
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Exceptions:
4. See California Fire Code Chapter 11 and California Existing Building Code for the replacement of existing stairways. [DSA-AC] For applications listed in Section 1.9.1 regulated by the Division of the State Architect-Access Compliance, see Chapter 11B, Section 11B-202.
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