if it was from the radiator, there would be a pressure drop in the boiler, which would need constantly topping up. I would say there is a problem outside, like a leaking downspout or gutter or drainage issue
Thanks for the reply - coincidentally the pressure on the boiler was 0.3 and for the 6 months I had the tenant in the house I had the pressure drop out 2-3 times. I have got a home buyers survey taking place tomorrow - preparing to get it sorted and wondering where to find the source and rectify - last thing I want is a damp specialist recommending over priced works. laminate is moves about 3-5mm if I stand on it in the corner
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