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Uniform Federal Accessibility Standards (UFAS)

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)).

Diagrams showing headroom clearance 80 inches (2030 mm) minimum, with a 4 inches (100 mm) maximum projection from wall and bottom of the projection higher than 27 inches (685 mm) for walking parallel to a wall.

Figure 8(a) Walking Parallel to a Wall

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.

Figure 8(c) (cont.)

Overhead Hazards

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