Guidance on the 2010 ADA Standards for Accessible Design

• Sections 4.8.5 and 4.9.4 of the 1991 Standards require handrail gripping surfaces to be continuous, and to be uninterrupted by newel posts, other construction elements, or obstructions. Section 505.3 of the 2010 Standards sets technical requirements for continuity of gripping surfaces. Section 505.6 requires handrail gripping surfaces to be continuous along their length and not to be obstructed along their tops or sides. The bottoms of handrail gripping surfaces must not be obstructed for more than twenty percent (20%) of their length. Where provided, horizontal projections must occur at least 1 ½ inches below the bottom of the handrail gripping surface. An exception permits the distance between the horizontal projections and the bottom of the gripping surface to be reduced by 1/8 inch for each ½ inch of additional handrail perimeter dimension that exceeds 4 inches.