2019 California Standards for Accessible Design Guide (effective January 1, 2020 with July 1, 2021 amendments)
1131A.2 Changes greater than ½ inch.
Changes in level greater than ½ inch (12.7 mm) shall be made by means of a sloped surface not greater than 1 unit vertical in 20 units horizontal (5-percent slope), or a ramp, elevator or platform (wheelchair) lift. See Section 1122A for ramps and Section 1124A.11 for platform (wheelchair) lifts.
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