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Yes, I see what you mean. I have read that cavity insulation can make the problem worse if I do have some penetrating damp, so that worries me a bit, as well as the cost! Oh dear, not an easy answer it seems...

Hmmm, maybe that's it then. We are running a dehumidifier though. Bought it a couple of months back, as we have a couple of other problematic areas (musty smelling low-level cupboards in the kitchen and peeling paint on the inside of a window recess the other side of the room from the one in the...

Hopefully this shows the problem. So what would cause a thermal bridge? Debris in the cavity? IMAG0498 by Sam239 posted 23 Nov 2015 at 7:24 PM IMAG0495 by Sam239 posted 23 Nov 2015 at 7:24 PM IMAG0494 by Sam239 posted 23 Nov 2015 at 7:24 PM IMAG0493 by Sam239 posted 23 Nov 2015 at 7:24 PM...

Pictures of interior and exterior of a damp patch

Thanks for your reply - I will take some pictures when I get home this evening. No, not a bay and a small amount of condensation.

I had a damp patch under a ground floor window around a year ago. I re-sealed around the window in question, it dried out OK and I re-painted the wall a few weeks ago, so seemed to be problem solved. However, got up this morning to find a damp patch had appeared directly under the window. Only...