Section 504.4 covers the current ADA Standards for the tread surfaces on stairways.
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Tread Surface: ADA Standard Section 504.4
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Tread Obstacles on Trails
A tread obstacle is anything that interrupts the evenness of the tread surface. On trails, tread obstacles often occur as a result of ruts, roots, and rocks in the tread surface....
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7.4.2 Clear Tread Width
The clear tread width of the trail shall be at least 36 inches (915 mm)....
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Trail Tread
The portion of a trail upon which traffic moves....
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Clear Tread Width of Trails
Clear tread width is the width of traveled surface between obstacles on the ground and above the ground (figure 129). Provide at least 36 inches (915 millimeters) of clear tread width....
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Tread
Tread—The portion of a trail, outdoor recreation access route, or beach access route where traffic moves (for pedestrian routes, this is the walking surface)....
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Minimum Tread Width
Minimum Tread Width. The width of the usable part of the tread width at the narrowest point on a trail....
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Minimum Trail Width
Minimum Trail Width. The width of the trail tread and the adjacent usable surface at the narrowest point on a trail. ...
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Clear Tread Width
Clear Tread Width. The width of the usable trail tread and adjacent usable surface....
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7.4.6 Tread Obstacles
Tread obstacles on trails shall not exceed 2 inches (50 mm) in height measured vertically to the highest point. ...
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1017.3 Clear Tread Width
The clear tread width of trails shall be 36 inches (915 mm) minimum....
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1017.3 Clear Tread Width
The clear tread width of trails shall be 36 inches (915 mm) minimum....
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Tread Width
The visible trail surface measured perpendicular to the direction of travel....
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Tread Obstacles [1017.5]
The vertical alignment of joints in concrete, asphalt, or board surfaces, as well as natural features, such as tree roots and rocks, within the trail tread can be tread obstacles....
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Openings in Trail Surfaces
Openings are gaps in the surface of a trail. Gaps include slots in a drainage grate and spaces between the planks on a puncheon, bridge, or boardwalk....
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Trail Constructed Feature
Trail Constructed Feature—A constructed feature that functions as part of the trail tread. Examples include puncheon, trail bridges, boardwalks, waterbars, and switchbacks....
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Clear Tread Width [1017.3]
The clear tread width of trails must be a minimum of 36 inches (figure 2)....
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1017.5 Tread Obstacles
The vertical alignment of joints in concrete, asphalt, or board surfaces on trails can be tread obstacles....
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Surfaces of Trails
Trail surfaces must be firm and stable....
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1017.3 Clear Tread Width
This section requires the clear tread width of trails to be 36 inches minimum....
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1017.6 Openings
This section requires openings in the surface of trails, passing spaces, and resting intervals such as spaces between the boards in a boardwalk to not allow passage of a sphere more than...
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7.4.1 Surface
The trail tread surface, including resting intervals and passing spaces, shall be both firm and stable....
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Resting Intervals [1017.8]
Resting intervals may be provided within the trail tread or adjacent to the trail tread....
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Trail Slopes
Short sections of steeper trail are allowed so that trails can be constructed in varying terrain....