2016 California Standards for Accessible Design Pocket Guide - Eff. Jan. 1, 2017
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:
1. Animal containment areas shall not be required to comply with Section 11B-303.
2. 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 ADAS] 303.2 Vertical. Changes in level of ¼ inch high maximum shall be permitted to be vertical.
FIGURE 11B-303.2
VERTICAL CHANGE IN LEVEL
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.
[2010 ADAS] Advisory 303.3 Beveled. A change in level of ½ inch (13 mm) is permitted to be ¼ inch (6.4 mm) vertical plus ¼ inch (6.4 mm) beveled. However, in no case may the combined change in level exceed ½ inch (13 mm). Changes in level exceeding ½ inch (13 mm) must comply with 405 (Ramps) or 406 (Curb Ramps).
FIGURE 11B-303.3 BEVELED CHANGE IN LEVEL
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:
1. A warning curb is not required between a walk or sidewalk and an adjacent street or driveway.
2. A warning curb is not required when a guard or handrail is provided with a guide rail centered 2 inches (51 mm) minimum and 4 inches (102 mm) maximum above the surface of the walk or sidewalk.
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