All steps on a flight of stairs shall have uniform riser heights and uniform tread depths. Risers shall be 4 inches (102 mm) high minimum and 7 inches (178 mm) high maximum....
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11B-504.2 Treads and risers
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Stairways [§504]
Stairways [§504] Requirements for stairways address treads and risers, surfaces, nosings, and handrails....
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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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Tread Width
The visible trail surface measured perpendicular to the direction of travel....
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1017.2 Surface
This section requires the surface of trails, passing spaces, and resting intervals to be firm and stable. A firm trail surface resists deformation by indentations....
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Wet Conditions: ADA Standard Section 504.7
Section 504.7 covers the current ADA Standards for wet conditions at stairways.
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11B-504.7 Wet conditions
Stair treads and landings subject to wet conditions shall be designed to prevent the accumulation of water....
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Surface: ADA Standard Section 810.2.1
Bus stop boarding and alighting areas shall have a firm, stable surface....
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1011.5 Stair treads and risers
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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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Floor or Ground Surface: ADA Standard Section 403.2
Section 403.2 covers the current ADA Standards for floor or ground surfaces that are part of an accessible route.
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TREAD
The horizontal part of a step.
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Tread Obstacles on Outdoor Recreation Access Routes
A tread obstacle is anything that interrupts the evenness of the tread surface....
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Floor or Ground Surface: ADA Standard Section 1002.4.1
The floor or ground surface of wheelchair spaces shall be stable and firm....
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Floor or Ground Surface: ADA Standard Section 802.1.1
The floor or ground surface of wheelchair spaces shall comply with 302. Changes in level are not permitted. EXCEPTION: Slopes not steeper than 1:48 shall be permitted....
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Treads and Riser Specifications in the ADA Standards (§504)
Treads and Riser Specifications in the ADA Standards (§504) Nosing Specifications...
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R408.2 Treads and Risers
R408.2 Treads and Risers. All steps on a flight of stairs shall have uniform riser heights and uniform tread depths....
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7.4.3.2 Cross Slope
Where the surface is paved or is elevated above the natural ground, the cross slope shall not be steeper than 1:48 (2 percent). ...
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Treads & Risers
[ADA Stds. 4.9] Yes __ No __ N/A __ Comments: ___________________________________________ ...are all stair treads the same depth (at least 11" deep), measured riser to riser, to prevent...
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Surface Slopes
The final rule requires clear ground spaces to have slopes not steeper than 1:48 in any direction and, where the surface is other than concrete, asphalt, or boards, permits slopes not steeper...
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1011.5.2 Riser height and tread depth
... Exceptions: 4. See California Fire Code Chapter 11 and California Existing Building Code for the replacement of existing stairways. [DSA-AC] For applications listed in...
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Nosings: ADA Standard Section 504.5
Section 504.5 covers the current ADA Standards for stair nosings.
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7.2.2.1 Determining Impracticability
The surface is not firm and stable for a distance of 45 feet or more (14 m). Limiting Factor 3. ...
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Surfaces for Outdoor Recreation Access Routes
Firm and stable surfaces prevent assistive devices from sinking into the surface....