I am hoping that someone on here can please give me some ideas as to how to solve my problem. I re-tiled my hall bathroom and kitchen floors. In my hallway damp patches seem to be working their way up my walls the plaster was affected. I got a plumber thinking I had a water leak and hired and listening device for locating any leakage in the pipes that could be causing the dampness. The main point of damp seems to be at the connecting just outside bathroom and kitchen this area seemed to be the main point.
To cut a long story short we dug up floor where the walls were damp in 3 places and exposed the water pipes and there is no water leaks all pipes are dry . We tiled on top of tiles and when digging there was moisture on top of original tile and under the new tiles so we are at a complete loss as to where this moisture is coming from.
At the min I have 3 holes in my hall floor and an dehumidifier plugged in. SO PLEASE can anyone give some advice as to where to go from here to rectify. I am fixing this out of my own pocket so no insurance involved