Guidance on the 2010 ADA Standards for Accessible Design

The 1991 Standards, at sections 4.8.5, 4.9.4, and 4.26, and the 2010 Standards, at section 505, contain technical requirements for handrails. The 2010 Standards provide more flexibility than the 1991 Standards as follows:

• Section 4.26.4 of the 1991 Standards requires handrail gripping surfaces to have edges with a minimum radius of 1/8 inch. Section 505.8 of the 2010 Standards requires handrail gripping surfaces to have rounded edges.

• Section 4.26.2 of the 1991 Standards requires handrail gripping surfaces to have a diameter of 1 ¼ inches to 1 ½ inches, or to provide an equivalent gripping surface. Section 505.7 of the 2010 Standards requires handrail gripping surfaces with a circular cross section to have an outside diameter of 1 ¼ inches to 2 inches. Handrail gripping surfaces with a non-circular cross section must have a perimeter dimension of 4 inches to 6 ¼ inches, and a cross section dimension of 2 ¼ inches maximum.

• 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.

• Section 4.9.4 of the 1991 Standards requires handrails at the bottom of stairs to continue to slope for a distance of the width of one tread beyond the bottom riser nosing and to further extend horizontally at least 12 inches. Section 505.10 of the 2010 Standards requires handrails at the bottom of stairs to extend at the slope of the stair flight for a horizontal distance at least equal to one tread depth beyond the last riser nosing. Section 4.1.6(3) of the 1991 Standards has a special technical provision for alterations to existing facilities that exempts handrails at the top and bottom of ramps and stairs from providing full extensions where it will be hazardous due to plan configuration. Section 505.10 of the 2010 Standards has a similar exception that applies in alterations.

A commenter noted that handrail extensions are currently required at the top and bottom of stairs, but the proposed regulations do not include this requirement, and urged the Department to retain the current requirement. Other commenters questioned the need for the extension at the bottom of stairs.

Sections 505.10.2 and 505.10.3 of the 2010 Standards require handrail extensions at both the top and bottom of a flight of stairs. The requirement in the 1991 Standards that handrails extend horizontally at least 12 inches beyond the width of one tread at the bottom of a stair was changed in the 2004 ADAAG by the Access Board in response to public comments. Existing horizontal handrail extensions that comply with 4.9.4(2) of the 1991 Standards should meet or exceed the requirements of the 2010 Standards.

Commenters noted that the 2010 Standards will require handrail gripping surfaces with a circular cross section to have an outside diameter of 2 inches, and that this requirement would impose a physical barrier to individuals with disabilities who need the handrail for stability and support while accessing stairs.

The requirement permits an outside diameter of 1 ¼ inches to 2 inches. This range allows flexibility in meeting the needs of individuals with disabilities and designers and architects. The Department is not aware of any data indicating that an outside diameter of 2 inches would pose any adverse impairment to use by individuals with disabilities.