Originally Posted by darsunt
The upstairs shower leaks intermittantly into the bedroom below. Sometimes it leaks during a shower (usually after running it awhile) and sometimes it doesn't.
Our maintenance guy was convinced it was water spilled out on the floor, but I caulked the entire bathroom and the leaks continue.
Take a look behind all of the trim plates on the fixtures. A fairly common source of intermittent leaks, as the caulking around the valve stem penetrations falls out and when water runs down the shower wall a certain direction or volume , it gets behind the trim and into the walls, and drips down.
Here is a real quirky one we recently experienced with older plumbing. While doing a downstairs renovation, a leak appeared one morning while the owner was taking a shower, located directly above. Checked everything, but all of the tile in the shower and bathroom floor was in excellent shape, checked the penetrations as above, they were sealed good, but resealed them anyway. No more leaks for the entire duration of the remodel (several months, as it was entire downstairs). Suddenly one morning, a wet spot shows in the ceiling paint. We go there and check everything in sequence again. Pour water on the bathroom floor(no Leak), plug the shower drain and fill the base to the top of the curb (no leak after 4 hrs), put a garden hose in the drain and run it( no leak after an hour or so), hose the shower walls down for half an hour,(no leaks, run both hot and cold valves (no leaks). We are now leaning to the unpleasant thought of having to break open walls to look for the mystery, when the guy with me suggests that could it be possible to have a worn spot in a valve stem that only leaked when the valve was opened to that particular spot. Since the fixtures were about 15 years old, we pulled the stems, and went to a local shop that specializes in repair parts to match them.We changed out the seats, installed the new stems, and it has been more than 7 months with no problems. Our fingers are still crossed.