Damp Staining on Chimney Breasts: The Hidden Role of Salts in Plaster
If you’ve noticed unsightly brown or yellow staining on a chimney breast, your first instinct might be to assume you have an active damp problem, perhaps a leaking roof or defective flashing.
While that can sometimes be the case, there’s another, often overlooked culprit: salt contamination within the plaster.



