I have a townhouse and my living room wall is shared with my neighbors wall. I have some floating shelves on this wall, one day they fell over. While inspecting the issue, I notice that the wall anchors for the shelves were damp, then to my surprise I was able to pull the anchors out by hand because the area around it was moist. Something behind this wall is definitely wet. But I'm far from the kitchen and bathroom. I have no idea where or how to find this leak, and it can possibly be from my neighbor.
where do I start to address this issue???
where do I start to address this issue???