Doing a custom house, looks like a 3 story "Large House with Patio" and am trying to place ladders instead of stairs. Can't walk up any of them. Tried 1-3 tiles free above the ladders but still not working, I just can't walk up them. Can they be placed on the first floor if there is a ceiling on the second (floor on 3rd)? I was able to place on the roof, but of course there was no floor or anything above it. I have placed ladders before, but it was always when nothing was above the floor they are going up to.