Thresholds at Doorways [4.13.8]
Thresholds complicate wheelchair maneuvering through doors, especially at doors equipped with closers. Negotiating level changes while simultaneously resisting the force of closers can be difficult. Also, thresholds can be hard to cross on the diagonal as is often the situation encountered by a person using a wheelchair. ADAAG specifies a maximum threshold height of ½ inch, but allows a height up to ¾ inch at exterior sliding doors where necessary to prevent water damage. Thresholds above ¼ inch must be beveled with a slope no greater than 1:2.
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