I have a leak developing in my ceiling that is coming from what I assume to be the upstairs bathroom. This first happened when my pipes needed to be snaked a bit over a year ago where, during that, the water supply to the house was shut off. There is a nice little bubble in the drywall from that first time, but I let it go since it hasn't leaked since and it's in a room I currently am not using.
SO.... when I got home last night the cold water in the upstairs shower would not shut off. I turned off the house's water supply, got a new valve this morning and replaced it... BUT when I came home from the hardware store (water supply has been off all night/ morning) I heard that familiar DRIP DRIP DRIP and ran to the back room where the ceiling was leaking a LOT... So much that it proceeded to go through another level into my basement. There have been no leaks for well over a year and it HAS to be because the main water supply was turned off. It never clicked with me about the first time this happened that it was not a slow leak but maybe a pressurized leak?
Is the best thing to do to remove the drywall around the bubble and see if the culprit is directly above or are there some other things I can/ should be checking? I know that I will need to replace the ceiling either way at some point, but I don't want to bother until the source of the leak is found.
Most suggestions that I have found are for leaks when water supply is on... so I am not certain where to start since this is only a problem when the water to my house is shut totally off.