Hi There I've got a similar problem I've recently moved into a property and when the heating went on, I noticed a strange musty smell. I looked behind the radiator, and realised that the back of the entire radiator area was full of black damp and mould. I informed the landlord immediately. The landlord got a builder round who said there was a high moisture in the internal walls in the bedroom. He also said that that the black mould and damp was due to condensation. He then got a massive quote for removal of contaminated plaster, wall treatment, installation of a horizontal damp proof course (although he said the building already has a course) and two air bricks. Now my landlord is planning to withhold my deposit due to lack of ventilation in the room. I have explained to him that I brought this problem to his attention and that as its a ground floor flat, I can't keep the windows open whilst I'm at work. I've only been in the property five months and I always keep the windows open as much as possible, as I can't stand the smell. Also, he's admitted to having damp in the bathroom (due to no windows) and the black marks everywhere are still visible. Any advice gratefully received!

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