Amnesia editor - Object Collisions?

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Isn't there any space between the upper floor and the ceiling of the floor below it, where you can hide the part of the beam? You know, like this? (Behold my amazing paint skillz!)
  beam.jpg (Size: 32.03 KB / Downloads: 214)

but as you might suggest to lower it, on the bottom side there is always a gap between the beam and ceiling..

Have you tried turning grid snapping off, so you can move the beam more precisely? It should be possible to place it in a way where it touches the ceiling perfectly without going through the upper floor. I mean it's possible in real houses too, right? (of course only if the ceiling/ floor has a certain realistic thickness to it, like on my drawing.)