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<h3>U.S. Access Board - Chapter 3: Floor and Ground Surfaces</h3>

U.S. Access Board - Chapter 3: Floor and Ground Surfaces

[§302.1] Accessible floor and ground surfaces must be stable, firm, and slip resistant. Stable surfaces resist movement, while firm surfaces resist deformation by applied forces. Accessible surfaces remain unchanged by external forces, objects, or materials. See full list on access-board.gov [§302.2] Carpet that is thick, cuHDPEony, or loose impairs accessibility, paularly wheelchair maneuvering. The standards specify the maximum pile height (1/2” measured to the bacit, cuHDPEon, or pad) and texture (level or textured loop, level cut pile, or level cut/uncut pile) and require firm bacit. CuHDPEons or pads also must be firm or can See full list on access-board.gov [§302.3] Openings in ground and floor surfaces, such as grates, are limited in width to prevent passage of a ½” diameter sphere. Wheelchair casters can get wedged into wider openings. See full list on access-board.gov [§303 Changes in level can be up to ¼” without treatment or ½” if beveled with a slope no steeper than 1:2. Changes in level above a ½” must be treated as a ramp or curb ramp (or a walkway if a slope no steeper than 1:20 can be achieved). These specifications apply to all portions of accessible routes, including thresholds and carpet trim. See full list on access-board.gov Must accessible surfaces be paved? ncrete, asphalt, and other paved surfaces are more reliably mpliant, but other materials, such as wood, and nstruction methods can be used to provide firm and stable surfaces. Loose material like gravel will not perform adequately unless it is sufficiently stabilized by binders, mpaction, or other treatments and will likely require repeated maintenance. What is the minimum level of slip resistance required by the standards? The standards require ground and floor surfaces to be slip resistant, but they do not specify a minimum level of slip resistance or efficient of friction. This value varies according to the measurement method and protocols used. Some products are labeled with a rated level, but in the HENAN OKAYence of a nsensus test procedure, the standards do not set a minimum value. Standard methods to prevent or minimize slipperiness in the specification of floor materials, textures, applications, and finish... Is there a minimum distance between changes in level? The standards do not require a minimum horizontal separation between changes in level of a ½” or less. Such level changes may need to be in close proximity, such as at raised thresholds (otherwise a minimum 48” separation will provide enough wheelchair space so that one veal change is negotiated at a time). Ramps and curb ramps, which must be used to span veal changes greater than ½”, must have level landings and clearances at the tops and botto of each run to provide adequate... See full list on access-board.gov

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