ABA Accessibility Standard for GSA Facilities Pocket Guide
303 Changes in Level
Where changes in level are permitted in floor or ground surfaces, they shall comply with 303.
EXCEPTIONS: 1. Animal containment areas shall not be required to comply with 303.
2. Areas of sport activity shall not be required to comply with 303.
Changes in level of ¼ inch (6.4 mm) high maximum shall be permitted to be vertical.
Figure 303.2 Vertical Change in Level
Changes in level between ¼ inch (6.4 mm) high minimum and ½ inch (13 mm) high maximum shall be beveled with a slope not steeper than 1:2.
Figure 303.3 Beveled Change in Level