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Damp In Middle of Wall Corner in Victorian Flat

Posted: Sat Jan 04, 2020 11:48 am
by homeowner55
https://imgur.com/B8HOaNg

Hi All

Anyone know where to start with this? The damp patch starts in the middle between the ceiling and the floor. I'm in a 3rd floor victorian flat. What tradesman am I best calling for help? (I'm not a DIYer)

Thanks