Above - Stains on the rear bedroom chimney breast and ceiling. This is a short example of the problem I investigated this week in Harrogate, West Yorkshire. Salt contamination from concentrated flue gas salts which persist has caused this issue. Typical symptoms are damp patches, which may or may not be salty looking.. If you are unsure whether you have damp on your chimney breast wall or in the stack, here are a few common signs to look out for: Reoccurring damp patches that come and go on or around your chimney breast, worsening during wet weather. Damp marks on chimney breast wall, usually in a yellow or brown colour. Damp in your loft or attic located.

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Hi all. To give some context, I've just moved into a mid-terraced 1940s property. Downstairs there is a functional gas fire fitted into the chimney breast. Upstairs in the main bedroom, this same chimney breast is showing signs of damp on both the wall and ceiling (see photos attached). The survey of the property recommended that the unused.. The Fix for the Chimney Base. If you have found that you do not in fact have a Damp Proof Course in your chimney breast then it is a good idea to add one. You can do this by drilling holes into your chimney breast about six inches up from ground level and injecting a chemical cream DPC into the holes.