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Note: This document or portion of document references a state or local code that is stricter than the 2010 ADA Standards requires.

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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