Strange, I was playing a GBA game where there's a Mansion area and in it there are a few short points where you can access the exterior sections of it in order to access other portions of the interior. In the English version's Sound Test the name for the BGM used there is "Roof," however, when I inspected the original Japanese version's title it was "屋上." Most of these sections are just small walkways, but I'm uncertain if they'd be considered a rooftop or not, maybe they'd count as a "terrace" since those seem to fall under the description of a rooftop. Though there is one part where you are undeniably on a part of the roof itself, so I imagine that the original title must be referring to the walkways, assuming that they actually count as rooftops.It's the latter. 屋上 usually refers to flat rooftop, and the top of typical triangular roof isn't called 屋上.