I've had a downstairs bathroom re-fitted, but a few weeks after finishing I noticed damp in an adjoining room, lifted the vinyl flooring to find the concrete floor soaking wet. The fitters had left a leak in the newly boxed in pipes. The flooring and bathroom fittings have all been removed. I've had a de-humidifier and fan running in the room for a month now, but can still detect damp in places in the floor. I don't have a damp meter, but use a multi-meter on the 2meg ohms scale. It's a '50s-'60s built property and it looks like the floor was originally laid with thin, hard tiles, stuck down on bitumen/tar like compound. I suspect this black stuff is preventing the concrete from breathing to expel the moisture.
Any suggestions as to what I can do?
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How to dry a wet floor new
How to dry a wet floor new