Can’t put a roof on the ceiling!

@Smoopie6 

It sounds like the game is not recognizing that the room is enclosed.  Here are a couple of things I thought of that you can try.

Check to make sure that you have all the rooms fully enclosed with 4 walls.

Another thing you can try is to delete the ceilings then put them back. 

If you used any platforms, then change the wall height and see if you can place the roof then.

If you still can't get the roofs to place, then how about adding a picture to your post so we can see the problem.

Hope this helps.