My sims dont have the roof over head

[wxrated]

Hi! Instead of building the whole second floor as an expansion of a house I decided to build a second floor only on top of one room, a little bit like a place to chill out, partially a balcony (I put two columns on the balcony also for the roof to support itself). Everything is built and looks nice, balcony there, room there, walls there, stairs there, but there is no way I can get the roof over that little second floor I made. Tried to delete first floor's roof, no way. Tried to find where to disable the auto roof option, no way. The roof seems to give me no control whatsoever :omg:Any idea what I could do?