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2010 ADA Standards for Accessible Design Pocket Guide

405.9.2 Curb or Barrier.

A curb or barrier shall be provided that prevents the passage of a 4 inch (100 mm) diameter sphere, where any portion of the sphere is within 4 inches (100 mm) of the finish floor or ground surface. [S.H. 4.8.7]

An elevation drawing shows a vertical clearance of less than 4 inches (100 mm) between the ramp surface and the bottom edge of a horizontal rail.

Figure 405.9.2 Curb or Barrier Edge Protection


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