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Garage ceiling leaking - need flashing or sheeting installed

Hi, I have a concrete garage with a concrete walls and ceiling. The ceiling has some leak spots with rusty water. I want to stop this from dripping in my car and so would like some flashing or sheeting installed in the garage as a semi permanent measure (I intend to demolish the garage in the near future). It doesn't necessarily have to cover the whole ceiling, it could just be some flashings where the leaks are. Looking to get this installed pretty soon, to prevent damage to my car. Thanks.