2016 California Standards for Accessible Design Pocket Guide - Eff. Jan. 1, 2017
11B-504.3 Open risers.
Open risers are not permitted.
Exceptions:
1. On exterior stairways, an opening of not more than ½ inch (12.7 mm) may be permitted between the base of the riser and the tread.
2. On exterior stairways, risers constructed of grating containing openings of not more than ½ inch (12.7 mm) may be permitted.
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