I used to practice architecture. In general (1) there are not regulations/laws/codes requiring the practice. The gaps at the floor are to facilitate mopping and

I used to practice architecture. In general (1) there are not regulations/laws/codes requiring the practice. The gaps at the floor are to facilitate mopping and reduce the damage from overflow floods. For first responder access, I have seen a hospital requirement for outswinging doors for one-holers with privacy locks. This allows the door to be opened when a person is collapsed against the door. (1) “In general” because there are almost certainly niche regulations that require it. For example the construction standards of a state prison bureau, local board of education, etc.