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ADAAG Manual

Note: This document, portion of document or referenced document was published prior to the 2010 ADA Standards, and is still applicable.

Width [4.7.3] and Surface [4.7.4]

The minimum clear width of a curb ramp is 36 inches, exclusive of flared sides. Curb ramp surfaces, including flared sides, must comply with requirements in 4.5 for ground and floor surfaces be "stable, firm, and slip resistant." The cross-slope of the curb ramp (2% maximum) must be minimized because it makes wheelchair travel difficult by distributing weight and required force to one side and causing front casters to veer.

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