The following excerpt from the current California Building Code (2013) outlines the restrictions in place for detectable warning tiles in the state of California.
11B-705 Detectable warnings and detectable directional texture
11B-705.l.1 General. Detectable warnings shall consist of a surface of truncated domes and shall comply with Section11 B-705.
11B-705.l.l.1 Dome size. Truncated domes in a detectable warning surface shall have a base diameter of 0.9 inch (22.9 mm) minimum and 0.92 inch (23.4mm) maximum, a top diameter of 0.45 inch (11.4 mm)minimum and 0.47 inch (11.9 mm)maximum, and a height of 0.18 inch (4.6 mm) minimum and 0.22 inch(5.6 mm) maximum.
11B-705.1.l.2 Dome spacing. Truncated domes in a detectable warning surface shall have a center-to-center spacing of 2.3 inches (58 mm) minimum and 2.4 inches (61 mm) maximum, and a base-to-base spacing of 0.65 inch (16.5 mm) minimum, measured between the most adjacent domes on a square grid.
Exception: Where installed in a radial pattern, truncated domes shall have a center-to-center spacing of 1.6 inches (41 mm) minimum to 2.4 inches (61 mm) maximum.
11B-705.l.l.3 Color and contrast. Detectable warning surfaces at transit boarding platform edges, bus stops, hazardous vehicular areas, reflecting pools, and track crossings shall comply with Section 11B-705.1.1.3.1. Detectable warnings at other locations shall comply with either Section 11b-705.1.1.3.1. or Section 11B-705.1.1.3.2. The material used to provide visual contrast shall be an integral part of the surface.
11B-705.1.1.3.1 Detectable warning surfaces shall be yellow and approximate FS 33538 of Federal Standard 595C.
11B-705.1.1.3.2 Detectable warning surfaces shall provide a 70 percent minimum visual contrast with adjacent walking surfaces. Contrast in percent shall be determined by:
Contrast = [(BI-B2)/B1J x 100 percent where
B1 = light reflectance value (LRV) of the lighter
B2 = light reflectance value (LRV) of the darker
Exception: Where the detectable warning surface does not adequately contrast with adjacent surfaces, a 1 inch (25 mm) wide minimum visually contrasting surface shall separate the detectable warning from adjacent walking surfaces. The visually contrasting surface shall contrast with both the detectable warning and adjacent walking surfaces either light-on-dark, or dark-on-light.
11B-705.1.1.4 Resiliency. Detectable warning surfaces shall differ from adjoining surfaces in resiliency or sound-on-cane contact.
Exception: Detectable warning surfaces at curb ramps, islands or cut-through medians shall not be required to comply with Section 11 B-705.1.1.4.
11B-705.l.2 Locations. Detectable warnings at the following locations shall comply with Section 11 B-705.1.
11B-705.1.2.1 Platform edges. Detectable warning surfaces at platform boarding edges shall be 24 inches (610 mm) wide and shall extend the full length of the public use areas of the platform.
11B-705.1.2.2 Curb ramps. Detectable warnings at curb ramps shall extend 36 inches (914 mm) in the direction of travel. Detectable warnings shall extend the full width of the ramp run less 2 inches (51mm) maximum on each side, excluding any flared sides. Detectable warnings shall be located so the edge nearest the curb is 6 inches (152 mm) minimum and 8inches (203 mm) maximum from the line at the face of the curb marking the transition between the curb and the gutter, street or highway.
Exception: On parallel curb ramps, detectable warnings shall be placed on the turning space at the flush transition between the street and sidewalk. Detectable warnings shall extend the full width of the turning space at the flush transition between the street and the sidewalk less 2 inches (51 mm) maximum on each side.
11B-705.1.2.3 Islands or cut-through medians.
Detectable warnings at pedestrian islands or cut through medians shall be 36 inches (914 mm) minimum in depth extending the full width of the pedestrian path or cut-through less 2 inches (51 mm) maximum on each side,, placed at the edges of the pedestrian island or cut-through median, and shall be separated by 24 inches (610 mm) minimum of walking surface without detectable warnings.
Exception: Detectable warnings shall be 24 inches (610 mm) minimum in depth at pedestrian islands or cut-through medians that are less than 96 inches (2438 mm) in length in the direction of pedestrian travel.
11B-705.1.2.4 Bus stops. When detectable warnings are provided at bus stop boarding and alighting areas, the detectable warnings shall extend the full width of the boarding/alighting area and shall be 36 inches (914 mm) minimum in depth.
11B-705.1.2.5 Hazardous vehicular areas. Detectable warnings at hazardous vehicular areas shall be 36 inches (914 mm) in width.
11B·705.l.2.6 Reflecting pools. When detectable warnings are provided at reflecting pools, it shall be 24 inches (610 mm) minimum and 36 inches (914 mm) maximum in width.
11B-705.1.2.7 Track crossings. Detectable warnings at track crossings shall be 36 inches (914 mm) in the direction of pedestrian travel and extend the full width of the circulation path.
11B-705.2 Detectable directional texture. Detectable directional texture at transit boarding platforms shall comply with Figure 11B-705.2 and shall be 0.1 inch (2.5 mm) in height that tapers off to 0.04 inch (1.0 mm), with bars raised 0.2 inch (5.1 mm) from the surface. The raised bars shall be 1.3 inches (33 mm) wide and 3 inches (76 mm) from center-to center of each bar. This surface shall differ from adjoining walking surfaces in resiliency or sound-an-cane contact. The color shall be yellow and approximate FS 33538 of Federal Standard 595C.
This surface will be placed directly behind the yellow detectable warning texture specified in Section 11 B- 705.1.2.1, aligning with all doors of the transit vehicles where passengers will embark. The width of the directional texture shall be equal to the width of the transit vehicle's door opening. The depth of the texture shall not be less than
36 inches (914 mm).
11B-705.3 Product approval.
Only approved DSA-AC detectable warning products and directional surfaces shall be installed as provided in the California Code of Regulations (CCR), Title 24, Part 1, Chapter 5, Articles 2, 3 and 4.
Refer to CCR Title 24, Part 12, Chapter 11B, Section 12- 11 B.205 for building and facility access specifications for
product approval for detectable warning products and directional surfaces