How do you fix a second floor bathroom leak coming from the bathtub water valve when turned on when water is dripping through the fan vent to the bathroom below creating a wet spot on the floor?

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Fixing a leak

You should first check fan vent outlet on roof - should have a flapper of some kind that may be stuck open or have a hole in it. If it only leaks when it is raining that is first clue. One other possibility is the vent pipe is running through cold attic causing condensation - you can wrap vent pipe with insulation to solve that one

More input from FAQ Farmers:

It isnt possible to fix a leak unless you know where the leak is coming from. It could be from the bath, basin, radiator, toilet. We need more information.

First answer by Neila222. Last edit by Neila222. Contributor trust: 2002 [recommend contributor]. Question popularity: 220 [recommend question]

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Dryer vent in floor? Your bathroom trim is wet what could be the problem? 2nd floor bathroom plumbing if it leaks can it leak to basement? How do you fix a second floor bathroom leak coming from the bath tub cold water valve only when turned on when water is dripping through the fan vent creating a wet spot on the floor? How do you fix a second floor bathroom leak when water is dripping through the fan vent creating a wet spot on the ceiling and floor? How can you stop water running to the seconf floor so you can fis the water leaking in the bathtub?