I built an addition onto an older house (not that it matters how old the house is, I'm sure) and put in a bathroom upstairs. About 3 weeks after the tub was put in, I used it to take a bath. A few hours later, after I went downstairs (my bedroom is still down there), I noticed water stains on the ceiling in the guest room. I had a friend come over and cut out the area in the ceiling where the water was and the next day I had a plumber come out. He said everything seemed to be in working order but that it looked like the water leaked from the overflow drain! I'm really ticked - I just finished the house and now I have to tear some of it up!! Does anyone have any suggestions on what to do to prevent this from happening again? I feel like this drain isn't doing its job. Ugh.