Every time we use the shower water drips down into the basement. Behind the shower plumbing is the master bedroom toilet. I have taken off the drywall between the two, from the toilet side, and I can't see any leaks in the shower plumbing. In poking around I have since noticed that the flooring around the base of toilet is spongy so the toilet has been leaking for some time. My question is, can the toilet leak because the shower is being used? Actually the leak seems to increase when the shower has just been turned off.
Thanks