Accessible stair treads require an 11-inch minimum depth and risers between 4 inches and 7 inches high. Stair nosing profiles feature curved and beveled options with a 1-1/4 inch maximum radius. Handrail gripping heights maintain a vertical clearance of 34 inches to 38 inches above stairs, ramps, and walking surfaces.
34" - 38" 11" MIN. 34" - 38" 34" - 38" 4"-7" (A) STAIRS (B) RAMPS (C) WALKING SURFACES (C) CURVED NOSING (D) BEVELED NOSING STAIR NOSINGS HANDRAIL HEIGHT TREADS AND RISERS FOR ACCESSIBLE STAIRS 1-1/4" MAX. 1-1/4" MAX.
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