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Rust-coloured stain coming through wall

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22 Jan 2023
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Daughter has just moved into a flat and found this brick/rust-coloured stain creeping up kitchen corner that backs onto garden area.
I assume it is moisture coming through brick work with faulty pointing, but could be completely wrong.

Kitchen.jpg


1. Is there a proper name for this condition?
2. Should landlord get a professional in to deal with, or
3. Can it just be coated over with special liquid and, if so, what type?

Any diagnosis / answers much appreciated!
 
Last edited:
There is clearly damp running along that angle corner. I can't see any paint bubbling though to either side of it.
 

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