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Also, for additional info in case helpful, the wall consists of insulation between two layers of concrete blocks, with another layer of plasterboard and paint. I spoke to a builder friend who said it was unusual for damp to appear like this as either side of the fine line is dry. Would greatly...

Thank you all for the responses. The markings just appeared over the past couple of days. If the plasterboard was cut out, would you expect the markings to appear two tears from the time it was built? Also, the paint on the outer ring (but not the inside area of the ring) is slightly damp. Is...

Hi all, I came home to a strange ring on my wall yesterday and am hoping somebody can help identify what is causing this. My first guess is that it is damp but it looks different to the usual signs of damp as the middle part seems unaffected and it is only the outer ring that seems to be...