Michael Ellars


Michael Ellars, AIA, APX, CSI, CDT, LEED AP, CASp

Chapter 11B, Division 3 (Building Blocks)

2013 CBC Revisions:
Intervening Code Cycle

Chapter 11B, Division 3 (Building Blocks) 

Clear Floor Space Overlap

11B-305.6 Approach. One full unobstructed side of the clear floor or ground space shall adjoin an accessible route or adjoin another clear floor or ground space. Clear floor or ground space may overlap an accessible route, unless specifically prohibited elsewhere in this chapter.

Clarified allowable overlap in design unless specifically prohibited, consistent with 2010 CBC and discussions with the US Access Board: “…as a general rule, clear floor space and accessible routes are permitted to overlap.”

Guy Braces/Supports

11B-307 Protruding objects

11B-307.4 Vertical clearance. Vertical clearance shall be 80 inches (2032 mm) high minimum. … Where a guy support is used parallel to a circulation path, including but not limited to sidewalks, a guy brace, sidewalk guy or similar device shall be used to prevent an overhanging obstruction.

Exception: …

11B-307.4.1 Guy braces. Where a guy support is used within either the width of a circulation path or 24 inches (610 mm) maximum outside of a circulation path, a vertical guy brace, sidewalk guy or similar device shall be used to prevent a hazard or an overhead obstruction.

Figure 11B-307-4-1. Guy Braces

Repositioned California Amendment as sub-section and revised language. Adjacent 24-inch dimension based on one-half of 48-inch clear width for accessible path of travel. Added new Figure 11B-307.4.1 Guy Braces for clarity.

Reach Ranges for Children

11B-308.4 Suggested reach ranges for children. Where building elements such as coat hooks, lockers, or operable parts are designed for use primarily by children, the suggested dimensions of Table 11B-308.4 shall be permitted. These dimensions apply to either forward or side reaches.

Table 11B-308.4
Suggested Dimensions for Children's Use

Forward or
Side Reach
3 and 4
5 through 8
9 through 12
36 inches
(914 mm)
40 inches
(1016 mm)
44 inches
(1118 mm)
20 inches
(508 mm)
18 inches
(457 mm)
16 inches
(406 mm)

These suggested reach ranges are from the model code (2010 ADA Standards). They can be applied where applicable elements are designed for use primarily by children ages 12 and under. Accessible elements designed for adult use or children over the age of 12 must use the typical adult reach ranges required in Division 3.