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Knowing The Law
The Americans with Disabilities Act (ADA) recognizes and protects the civil rights of people with disabilities. To ensure that buildings and facilities are accessible to and usable by people with disabilities, the ADA establishes accessibility requirements. One of those requirements is for the installation of detectable warning surfaces as indicated by the following sections of the ADA Accessibility Guidelines (ADAAG):
- R304.1 General. Detectable warnings shall consist of a surface of truncated domes aligned in a square or radial grid pattern and shall comply with R304.
- R304.1.1 Dome Size. Truncated domes in a detectable warning surface shall have a base diameter of 23 mm (0.9 in) minimum to 36 mm (1.4 in) maximum, a top diameter of 50 percent of the base diameter minimum to 65 percent of the base diameter maximum, and a height of 5 mm (0.2 in).
- R304.1.2 Dome Spacing. Truncated domes in a detectable warning surface shall have a center-to-center spacing of 41 mm (1.6 in) minimum and 61 mm (2.4 in) maximum, and a base-to-base spacing of 17 mm (0.65 in) minimum, measured between the most adjacent domes.
- R304.1.3 Contrast. Detectable warning surfaces shall contrast visually with adjacent gutter, street or highway, or walkway surface, either light-on-dark or dark-on-light.
- R304.1.4 Size. Detectable warning surfaces shall extend 610 mm (24 in) minimum in the direction of travel and the full width of the curb ramp (exclusive of flares), the landing, or the blended transition.
- R304.2 Location and Alignment:
- R304.2.1 Perpendicular Curb Ramps. Where both ends of the bottom grade break complying with R303.3.4 are 1.5 m (5.0 ft) or less from the back of curb, the detectable warning shall be located on the ramp surface at the bottom grade break. Where either end of the bottom grade break is more than 1.5 m (5.0 ft) from the back of curb, the detectable warning shall be located on the lower landing.
- R304.2.2 Landings and Blended Transitions. The detectable warning shall be located on the landing or blended transition at the back of curb.
- R304.2.3 Alignment. The rows of truncated domes in a detectable warning surface shall be aligned to be perpendicular or radial to the grade break between the ramp, landing, or blended transition and the street.
California Title 24 (CALTRANS)
Excerpts from the 2013 California Building Code, California Code of Regulations, Title 24, Part 2, Volume 1, California Building Standards Commission.
11B-705.1 Detectable Warnings
- 11B-705.1.1.1 Dome size. Truncated domes in a detectable warning surface shall have a base diameter of 0.9 inch minimum and 0.92 inch 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-70S.1.1.2 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, measured between the most adjacent domes on a square grid.
- 11B-70S.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 excluding any flared sides. Detectable warnings shall be located so the edge nearest the curb is 6 inches (152 mm) minimum and 8 inches (203 mm) maximum from the line at the face of the curb marking the transition between the curb and the gutter, street or highway.
- 11B-705.1.2.5 Hazardous vehicular areas. Detectable warnings at hazardous vehicular areas shall be 36 inches (914 mm) in width.
- 11B-70S.2 Detectable directional texture. Detectable directional texture at transit boarding platforms shall comply with Figure 11 B-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 conforming to Federal Color No. 33538. 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.
… k n o w t h e r e q u i r e m e n t s
R304.1.4 Curb Ramp and Size of Detectable Warning Area
- Full width of ramp excluding flares
- 24″ minimum in the direction of travel
R304.2.1 Perpendicular Curb Ramps
- Grade break less than 5 feet from back of curb
- Grade break greater than 5 feet from back of curb
R304.2.2 Landings and Blended Transitions
- Located on landing or blended transition at back of curb
- 24″ in the direction of travel
R304.2.3 Rail Crossing
- Edge nearest rail crossing is 6 feet minimum and 15 feet maximum from center line of the nearest rail
- Truncated domes shall be aligned to be parallel with the direction of wheelchair travel
R305.4 Medians and Pedestrian Refuge Islands
- Shall have detectable warnings that comply with R304 at ramps and blended transitions
- At cut through islands at curb line in-line with face of curb and shall be separated by a 2 foot minimum length of walkway without detectable warnings
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