2013 California Standards for Accessible Design Pocket Guide

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.

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.