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thanks Daz - in my case, the floor isnt concrete, it's a metal frame base with chipboard laid over it (like a Durabase installation). I have discovered a small hole in the damp proof membrane under the metal frame though, near the internal door, so maybe that's the cause of the problem in my...

Hi Bev, did you find out what was going on? As I have exactly the same problem as you and I'm also trying to make sense of it!