2022 California Standards for Accessible Design Guide (effective January 1, 2023)
11B-303 Changes in level
11B-303.1 General.
Where changes in level are permitted in floor or ground surfaces, they shall comply with Section 11B-303.
Exceptions:
- Animal containment areas shall not be required to comply with Section 11B-303.
- Areas of sport activity shall not be required to comply with Section 11B-303.
11B-303.2 Vertical.
Changes in level of ¼ inch (6.4 mm) high maximum shall be permitted to be vertical and without edge treatment.
[2010 ADA Standards] 303.2 Vertical. Changes in level of ¼ inch high maximum shall be permitted to be vertical.
11B-303.3 Beveled.
Changes in level between ¼ inch (6.4 mm) high minimum and ½ inch (12.7 mm) high maximum shall be beveled with a slope not steeper than 1:2.
11B-303.4 Ramps.
Changes in level greater than ½ inch (12.7 mm) high shall be ramped, and shall comply with Section 11B-405 or 11B-406.
11B-303.5 Warning curbs.
Abrupt changes in level exceeding 4 inches (102 mm) in a vertical dimension between walks, sidewalks or other pedestrian ways and adjacent surfaces or features shall be identified by warning curbs at least 6 inches (152 mm) in height above the walk or sidewalk surface.
Exceptions:
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