I was having a ceiling dripping water while the shower above it was running. It is a single tub/shower unit - 60" I think and plastic/fiberglass. I looked but did not see any smoking guns for the leak and thought perhaps the pipes were leaking somewhere. I was prepared to start ripping the tub out. It only leaked with showers though and not baths. So before I did the ripout, I re-sealed between the tub and the ceramic tile surround. Leak has stopped. So my question is, aren't tubs supposed to have a 1" or so lip going around them that the tile covers when the tile is laid for preventing just this type of leak? If so, is it possible the original installed for whatever reason removed that lip? The tub is around 18 years old and a Kohler. Thoughts? I think the only real way for me to tell for sure is to remove the bottom layer of tile and look at it.