I’ve posted this question every few years and I’m still looking for a good answer.  Last week an architect asked whether there is guidance in the codes or standards regarding the mounting location/maximum height for floor-mounted door stops, to ensure that the stop is not a tripping hazard.

The 2010 ADA Standards limit changes in level to 1/2-inch, or the change must be accomplished by a ramp (or lift or elevator).  This applies to walking surfaces on an accessible route, but how is the walking surface defined?  Floor stops are used all the time, so how/where is the line drawn between acceptable locations and violations of the codes and standards?

Here are a couple of examples from Matt Wildman and Scott Stepard of Allegion:



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