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[Ihtomyt]

I am trying to figure out if a constructed up stair on top of a hole has a base that can't be passed through. The information is probably on the wiki, but the stairs page doesn't make it clear. From the diagram, I worry that it does not block movement because there's a little diagonal gap with the missing floor. Basically, I accidentally punched a hole somewhere, and I covered it with a constructed floor. I would prefer that that space be an up stair, not a floor, but it will not allow me to place an up stair on top of a constructed floor (which is bizarre if you ask me). Can I remove the floor, place the up stair, and that space will be impassable from beneath? Or would it be passable to flying creatures and fluids then?

[Leonidas]

I'm pretty sure that the answer is yes. You could test it by building the up stair and putting a pond on the z-level above it. Watch the first dwarf dump his bucket on the tile and see where the water goes.

[Bumber]

It should be fine. There was a bug regarding flying creatures, but that involved down stairs and has been fixed.

[PatrikLundell]

As others have said, up stairs block access from below (I regularly build up stairs to block off exploration stairs that hit caverns). The bug concerning flying creatures affected (up+)down stairs, as Bumber said.

The reason you can't build on top of a constructed floor is technical: DF has room for only one constructed element in a tile, and that single slot is already taken up by the floor.

[Ihtomyt]

Thanks all! My OCD is (slightly) appeased!