We kind of have that, but it isn't by floor since its a one-story building, but we are an American small tech company. The engineering department (department I am in) is separated by a long glass wall. In side of there, we are expected to keep it quiet. Now, we are not discouraged from conversation, say I need to tap another engineer's shoulders and discuss some architecture. But it expected to keep it relatively quiet and not distracting. Other side of the glass wall, its a free for all.