Treads and Riser Specifications in the ADA Standards (§504) Nosing Specifications...
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  Treads and Riser Specifications in the ADA Standards (§504)
  
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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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  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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  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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  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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  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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  504.2 Treads and Risers
  504.2 Treads and Risers. All steps on a flight of stairs shall have uniform riser heights and uniform tread depths.... 
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  11B-504.4 Tread surface
  Stair treads shall comply with Section 11B-302. Changes in level, slopes exceeding 1:48, and detectable warnings shall not be permitted. Exception: Reserved.... 
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  Trail Tread
  The portion of a trail upon which traffic moves. 
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  504.2 Treads and Risers
  All steps on a flight of stairs shall have uniform riser heights and uniform tread depths. Risers shall be 4 inches (100 mm) high minimum and 7 inches (180 mm) high maximum.... 
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  504.2 Treads and Risers
  All steps on a flight of stairs shall have uniform riser heights and uniform tread depths. Risers shall be 4 inches (100 mm) high minimum and 7 inches (180 mm) high maximum.... 
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  Surface and Clear Tread Width on Beach Access Routes
  A beach access route must have a firm, stable surface, and have a clear tread width of 60 inches (1,525 millimeters) minimum.... 
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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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  1009.7  Stair treads and risers
  1009.7 Stair treads and risers. ...... 
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  4.9.2 Treads and Risers
  On any given flight of stairs, all steps shall have uniform riser heights and uniform tread widths.... 
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  11B-504.5 Nosings
  The radius of curvature at the leading edge of the tread shall be ½ inch (12.7 mm) maximum.... 
- Wooster Products Spectra Safety Treads (WP3C)
- Wooster Products Supergrit Safety Treads (231BF)
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  Tread Obstacles on Beach Access Routes
  Tread obstacles on a beach access route must not be more than 1 inch (25 millimeters) high.... 
- American Stair Corp. FasTrack Treads & Landings
- Wooster Products Supergrit Safety Treads (231BF)
- Wooster Products Inc. Stairmaster Safety Renovation Treads
