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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.

4.5.4 Gratings.

If gratings are located in walking surfaces, then they shall have spaces no greater than 1/2 in (13 mm) wide in one direction (see Fig. 8(g)). If gratings have elongated openings, then they shall be placed so that the long dimension is perpendicular to the dominant direction of travel (see Fig. 8(h)).

Figure 8(g) Gratings: Gratings shown with one dimension 1/2 inch maximum measured parallel to the predominant direction of travel.

Figure 8(h) Grating Orientation:  Gratings shown with long dimension perpendicular to route of travel.

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