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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.

4.5.2 Changes in Level.

Changes in level up to 1/4 in (6 mm) may be vertical and without edge treatment (see Fig. 7(c)). Changes in level between 1/4 in and 1/2 in (6 mm and 13 mm) shall be beveled with a slope no greater than 1:2 (see Fig. 7(d)). Changes in level greater than 1/2 in (13 mm) shall be accomplished by means of a ramp that complies with 4.7 or 4.8.

Cross section drawing showing a maximum 1/4 inch vertical change in level.

Fig. 7 Accessible Route

Cross section drawing showing a change in level 1/4 to 1/2 inch high with a 1:2 slope.

Fig. 7 Accessible Route


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