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The bottom section of the wall (other side is bathroom and a closet) has the following appearance - after prying out the planks that decorate the floor/wall interface.

The wall (in a high rise) does not appear to be wet a foot above from the floor and looks like an internal leakage, any help would be much appreciated.

Thank you so so much!

enter image description here

  • Obviously water from somewhere--either a pipe or the sky. Leaks tend to appear where the water accumulates, which is apparently the bottom of the wall cavity in this case. Did you have a more specific question? – isherwood Dec 3 '18 at 16:07
  • Wherever it's coming from, you're gonna wanna rip out the wet part of the wall so you can replace it. That might expose the source of the water. – Paul Price Dec 3 '18 at 21:56
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If it’s a wall in a high rise, I doubt if it’s a roof leak.

I’d guess 1) If there is a sink, toilet, etc. on the other side of the wall I’d check for a loose pipe , or 2) I’d check for ventilation/condensation problem.

1) The leak might be from a loose drainline that only leaks when it’s really really full. That is to say, it could take years to produce enough water to create that mold. Fill up the sink/tub and see what happens.

2) If your exhaust fan duct is not insulated, it could create a lot of condensation which can accumulate and run to the floor. (However, I don’t see mold streaks, so I doubt it could be that...)

  • I have seen condensation problems without visible mold but agree + – Ed Beal Dec 3 '18 at 21:59
  • Thank you so much for the responses. One particularity of the situation is that there is floorboard heating in the high rise - not sure if this detail matters. The other side of the wall is drainage/sink and was initially addressed but didn't seem to fix the issue. – t987h Dec 4 '18 at 17:08

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