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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.

Outdoor Conditions [4.8.8]

Exterior ramps must be designed so that water does not accumulate on the ramp or landing surface. A slope up to 2% is allowed at landings for adequate drainage. Wetness reduces slip-resistance, which is fully characterized not only by the ramp or floor surface but by the material making contact with it. Puddling that causes shoes, wheels, or crutch tips to become wet will reduce slip-resistance even where the ramp surface is dry. Water accumulation is a particular hazard where it can turn to ice. Recommendation: Covering ramps with a canopy or roof is not required but should be considered where wet or snowy conditions are likely.

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