Hi spils30 Whatever you have done it is unlikely that you will solve this problem in one hit. It looks like you have solid walls (rather than cavity ones) and that the exterior walls are rendered and painted. If this is the case then check the external rendering for cracks, even hairline ones. If there are some, fill the cracks then paint the wall to seal it. Check to make sure the DPC is above ground level and has not been bridged by the rendering. Get this corrected if it has. Internally scrape off loose paint and recover using a breathable wall paint - this will be an ongoing process. Regards S
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