I would use the word roof. The roof of the bus is severely damaged. If it is a double decker bus, you could say the ceiling of the lower deck is damaged.
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New2grammarWould you use the singular ceiling when it comes to a house? Or the plural which is consistent with "floors". If not, why?
ThanksYes, there are ceilings in a house.
Each room has a ceiling.
You can decorate the ceiling in one room and decide to decorate the other ceilings later in the year.