Visul Flexstone Panels
ADA Approved Detectable Warning Systems

'Patents Pending'

Pride in Excellence

QEP Corporation takes care to adhere to a strict code of rules set forth by the ADA. In our efforts to further prove our work to you, we have provided our DOT approval letters online!ada truncated domes

ADA Requirements

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 surfaces, 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.
R304.2.3 Rail Crossings. The detectable warning surface shall be located so that the edge nearest the rail crossing is 1.8 m (6 ft) minimum and 4.6 m (15 ft) maximum from the centerline of the nearest rail. The rows of truncated domes in a detectable warning surface shall be aligned to be parallel with the direction of wheelchair travel.

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If you head up a DoT or Commercial Business, we can help you with ADA compliant Detectable Warning Systems for the safety of visually impaired citizens in your community and within your premises.

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QEP Corporation supply (ADA) Americans with Disabilities Act approved truncated dome tiles and detectable warning systems that currently has (DoT) Department Of Transportation approval in the states of South Carolina, Michigan, Georgia, Texas, Alabama, New Mexico, Oregon, Tennessee, Oklahoma, Kentucky, Louisiana, Missouri, West Virginia, Minnesota and North Carolina.
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Contact us by Email: info@qepcorp.com