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2012 Florida Accessibility Code for Building Construction Pocket Guide

406.8 Detectable Warnings. Curb ramps subject to Department of Transportation regulation 49 CFR 37.21 shall have a detectable warning complying with 705. The detectable warning shall extend the full width of the curb ramp (exclusive of flared sides) and shall extend either the full depth of the curb ramp or 24 inches (610 mm) deep minimum measured from the back of the curb on the ramp surface.

The figure shows an elevation drawing of a single dome showing the base diameter as 0.9 to 1.4 inches and the top surface as having a diameter of 50% to 65% of the base.  The dome height is 0.2 inch. A plan view of a detectable warning surface showing the center-to-center dome spacing of 1.6 to 2.4 inches with a base-to-base separation of 0.65 inch minimum is shown. The plan view of a flared side curb ramp is shown with detectable warnings measuring 24 inches minimum deep from the back of the curb on the ramp surface for the full width of the ramp, excluding the side flares.

Figure 406.8 Detectable Warnings at Curb Ramps Subject to DOT Regulation 49 CFR 37.21


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