![]() ![]() The radius of curvature at the leading edge of the tread shall be no greater than 1/2 in (13 mm). The undersides of nosings shall not be abrupt. The nosing shall project no more than 1-1/2 inches (38 mm). Ed.]Įach stair tread is 11 inches (280 mm) deep minimum with a sloped riser. This makes sense in that nosings are typically rounded and are not a safe walking surface, nor do they support the stairway user's foot. The ADA specification measures from riser to riser, essentially excluding the additional amount of tread depth afforded by the tread nosing. [Note: this ADA detail for 11-inch stair tread width refers to what some specifications call stair tread "depth" - the distance from stair nose to stair riser on an individual stair tread. Stair treads shall be no less than 11 in (280 mm) wide, measured from riser to riser. On any given flight of stairs, all steps shall have uniform riser heights and uniform tread widths. Stairs required to be accessible by 4.1 shall comply with 4.9.Ĥ.9.2 Treads and Risers. ADA Section 4.9 StairĤ.9.1* Minimum Number. You will see from the quotation below that the ADA section 4.9 "Stairs" does not explicitly discuss short or low-riser stair steps nor "easily-climbable stairs" but instead is focused on step and railing standards to avoid falling hazards on normal stair dimensions. We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. This article series describes how to build safe, accessible stairs & handrailings. The US ADA section 4.9 includes detailed advice for accessible stair design including stair riser height, stair tread dimensions, stair nosings, handrailings, hand railing continuity, and handrailing extensions at the top and bottom of stairways. In the United States stair specifications for accessible stairways and safe, climbable steps and handrailings are discussed by the Americans with Disabilities Act, section 4.9, Stairs provided and illustrated here. ![]() We have no relationship with advertisers, products, or services discussed at this website.ĪDA Stair Specifications for stair & handrailing compliance with the Americans with Disabilities Act: The shower head and control area may be located on the back wall or on either side wall.InspectAPedia tolerates no conflicts of interest. Controls shall be located on the back (long) wall 27 inches (685 mm) from the side wall. The controls shall be placed in an area between 38-48 inches (965 -1220 mm) above the floor. The grab bar (or bars) shall be 33-36 inches (840-915 mm) high. A U-shaped grab bar (or three separate grab bars) shall be provided. The controls and spray unit shall be within 18 inches (455 mm) of the front of the shower.įigure 37(b) 30 in by 60 inches (760 mm by 1525 mm) Roll-in Stall. The controls shall be placed in an area between 38-48 inches (965-1220 mm) above the floor. The grab bar(s) shall be mounted 33-36 inches (840-915 mm) above the shower floor measured at the entry. An L-shaped grab bar (or two single grab bars with the ends close together) shall be provided, located along the full depth of the control wall (opposite the seat) and halfway (18 inches (455 mm)) along the back wall. The L-shaped shower seat shall be 18 inches (455 mm) above the floor measured at the entry. Figure 37(a) 36 in by 36 inches (915 mm by 915 mm) Transfer Stall. ![]()
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