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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!
Bainbridge-
We have some minor low level damp around the chimney in the 'dining' room in our Victorian 3 bed.
Has the chimney been capped properly? All too often it's just water getting in at the top and running down the chimney stack, now that there isn't a nice hot fire at the bottom to keep it all warm and dry.
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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
Brommers
bq
There is no such thing as 'damp'. It all has a cause. Fix the cause and you fix the problem.
Chemical injections are total bullshit.
https://www.architectsjournal.co.uk/archive/rising-damp-is-a-myth-says-former-rics-chief#:~:text=Stephen%20Boniface%2C%20former%20chairman%20of,a%20complete%20waste%20of%20money'.