As I am Remodeling my old house now a days and take advices from time to time on telephone or internet as i have no time left to go and find appropriate people and experts. I am facing a problem with Water Tank on the roof. which is the storage of water supply to whole house. Problem is that when ever it overflow and water came out of it flows all over the roof. slope level of roof is very good. but i am seeing that damp is appearing on my ceilings near that place of Water Tank. I want advice whether i should resolve this problem from inside or outside and how.