Help! Leak from upstairs bath/floor
Two bathrooms stacked one above each other. Upstairs bathtub/shower has tile floor; tile caulked to bathtub. When kid showers, water on floor leaks into ceiling of upstairs bath. I've opened up downstairs ceiling and ran water tests, and water is definitely coming from floor, not tub, toilet, or anything else.
It seems to me that water would migrate through grout, but most people don't have water leaking through tile upstairs, so most people have figured out how to solve problem. Help!
FWIW, I'm going to install a sliding glass door at the upstairs tub, but I want to make sure that the problem doesn't recur.