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[TKR101010]

Digging a 3x3 stairwell down to the cavern layer. Once the miners get to the level that the cavern layer is revealed, I cancel further digging down, and cap the stairwell so I can redirect it to elsewhere to more conveniently dig down to the cavern floor. Only one of the U/D stairs on the level that revealed the cavern layer was dug, so I replace the designations of the others Up stairs. Since nothing was previously dug in those spots I know they have floors and won't let anything in from below. This leaves me with one U/D stair that could let things in. I removed the Up part of that U/D stair, which leaves a Down stair. I can't build a floor and then build an Up stair in the same tile because a construction would be in the way. I can build an Up stair there, but I don't know if Up stairs come with floors built in to fill in the Down stairs part (like how a building a wall also give a floor to the level above it) to prevent passage.

Whether or not there's any floor, does building an Up stairs in this situation prevent things from crawling in from below, or do I need to take further measures to make sure things are secure?

[anewaname]

Up stairs come with floors, so you can just build an up stair in that tile.

Take a look at the picture in this wiki page.

[PatrikLundell]

For some reason you can't build an Up stair at the bottomost tile of a probing staircase hitting a cavern, but you can build on one tile up. However, this is the special case where it's a single tile staircase: if there's room to stand on the sides you should be able to build a floor or an Up staircase after digging out on of the Up staircases to the side.
I always probe with a single tile staircase, straight down. Once I've located the caverns and mapped them sufficiently I decide where to build my "real" staircases, which may use probing ones as the starting point.

[TKR101010]

Thank you.