Yeah. What I really meant was that if the house has a sloping roof, I use 'move_objects on' to put boxes in the area under the roof. Usually I don't even put in a floor.
I have quite an armada of boxes that often end up in houses. Most of them are for controlling sims' expressions and stuff, which I use a lot for making screen shots for stories.
Another habit I have gotten into is to put a one-square linoleum tile up there, always using the black-and-white checkerboard, and put the ceiling tile controller on it. That makes it a lot easier to find the controller when I want to make ceiling tiles visible.