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1991 ADA Standards for Accessible Design

Note: This document, portion of document or referenced document was published prior to the 2010 ADA Standards, and is still applicable.

4.4.2 Head Room.

Walks, halls, corridors, passageways, aisles, or other circulation spaces shall have 80 in (2030 mm) minimum clear head room (see Fig. 8(a)). If vertical clearance of an area adjoining an accessible route is reduced to less than 80 in (nominal dimension), a barrier to warn blind or visually-impaired persons shall be provided (see Fig. 8(c−1)).

Two diagrams showing a figure walking parallel to a wall. The figure on the left shows 80 inches (2030 mm) minimum vertical clearance under a sign reading "Lobby." A figure is shown parallel to a wall where the cane detectable range from the ground to the bottom of a protruding object is higher than 27 inches (685 mm) and the object protrudes 4 inches (100 mm) maximum. The figure on the right shows the clear width of the walking surface adjacent to a protruding object of any amount, where the bottom of the object to the ground is 27 inches (685 mm) or below.

Fig. 8 Protruding Objects

Figure 8(c-1) Overhead Hazards: Overhead Hazards. As an example, the diagram illustrates a stair whose underside descends across a pathway. Where the headroom is less than 80 inches, protection is offered by a railing (2030 mm) which can be no higher than 27 inches (685 mm) to ensure detectability.

Fig. 8 Protruding Objects


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