Concrete floors are very susceptible to damp especially the older houses as these did not have the same type of membrane if any compared to modern properties, which is basically a physical barrier between the ground (earth) and your floor. This should work into the damp proof course (DPC) of you'r walls to create continuity in the barrier, if there are any breaks/splits/rips or imperfections in the barrier then moisture will always find its way up to the surface in search of evaporation. seen as though it is very difficult to see exactly were the 'defect' in the barrier is as water does not always travel in straight lines, in most cases a full break up and removal of the concrete to the full area and a new membrane to be installed then re-screeded is the only way to know for sure you have fix the problem so to speak. But with new advancements in epoxy resin/ latex and tanking slurry there are ways of 'sealing the moisture in' depending on conditions of floor and expected traffic levels, but this method is not only a lot cheaper but a lot less disruptive.
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