Mystery damp patch on downstairs ceiling

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Mystery damp patch on downstairs ceiling

Mystery damp patch on downstairs ceiling

Hi. I have a damp patch on the ceiling in our early 20th C cottage. It began to appear over a year ago, very gradually getting bigger, emanating from a corner between an exterior wall and an exposed beam. Readings from a digital damp meter are around 55-60% at the worst point and drop to about 40% at the edge.
I have had a plumber in to investigate upstairs with the floorboards up. He noted some central heating pipes but due to the positioning and no sign of a leak, discounted them as the...

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by Joka1965

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