Floors and ceilings normally need little maintenance beyond ordinary cleaning and occasional refinishing for floors or redecoration for ceilings. Be on the lookout, however, for any changes in your floors and ceilings that may be the first hints of more serious problems like damp or structural movement. If you act quickly when such signs first appear, you may save yourself from considerable expense and disruption. The most common cause of a damp floor inside is a build-up of ground levels and poor drainage outside.