Water leak marks visible from room below bathroom, how to find the root cause?

[larrycan]

We can see these marks below two bathrooms in the floor above. Picture attached. Any ideas what could be causing it ?

 

[Reach4]

It could be one of these:

• Not positioning the shower curtain well
• Sloshing around in the tub spilling water onto the floor.
• A leak

 

[Sponsor]

 

[FullySprinklered]

How old is the house?

 

[Plumber69]

We can see these marks below two bathrooms in the floor above. Picture attached. Any ideas what could be causing it ?

If they are always there probly your water lines have have small pinholes. Cut it open

 

[Reach4]

If they are always there probly your water lines have have small pinholes.

If the marks are wet, yes. If they are dry stains, they could be from some past event. I had presumed the marks were dry, but I should not have presumed.

 

[Smooky]

The roof might be leaking around a vent pipe and it is following the pipe down through the wall to the ceiling below.