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I'd be looking at the chimney pointing, flashing and capping, and making sure that is all in good condition. Fix that and you ought to fix water ingress. A leaking roof or leaking or overflowing
can also cause this sort of issue.
Ground level issues are often caused by things like applying waterproof render or paint to walls which should breathe, thereby causing condensation problems, perished bricks, or obvious physical breaches of the original slate DPC. Welsh slate lasts for thousands of years and is almost always fine.Interesting article:
https://www.heritage-house.org/damp-and-condensation/the-fraud-of-rising-damp.html
bq
That is very interesting.
We have some minor low level damp around the chimney in the 'dining' room in our Victorian 3 bed.
We are about to rip up the flooring so I've asked the builder to investigate what's causing the damp. I'm wondering if it's connect to the adjacent fireplace which is blocked up and has been for at least 15 years.
I was considering a chemical DPC course in the area but having read that it seems like a waste of time!