Ladyzaun , what houseofmanuela said, and check out this article here too which goes into detail a bit more.
I always make my ceilings double, it automatically work for first story since you have a slab on top anyway, but for single story or first story (top floor) I make the ceiling with one plane, but then depending on the roof, if it's flat roof, it works the same as with a slab, so no problem, if it's a sloped roof a single plane for ceiling, and the roof itself over it, also fixes this issue. Otherwise, like what was said already, if you are just going to do a interior shot, no outside, then just block it off on the outside yes.
