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I have used a surveyor specialising in damp - they mostly confirmed what I thought, and had a few additional ideas. Let me dig out the report & see how I found them.
Solving damp is a bitnof an iterative process. Try one thing, see if it works, try another, does it improve, and so on.
I've done French drain (gravel filled), as there was a concrete path up against the wall.
Next up - PIV.
There's a wall needs repointing too.
On this damp conversation I've got a few varied damp issues at my place (end of terrace ~ 1910 house), some obvious causes, some not.
I'd like someone to come in and draw up some fixes (not just some fucker trying to sell a chemical DPC) which I could then pass to a builder/do myself.
Does such a person exist? Does anyone know one in North London. Is there some sort of qualification for this kind of stuff? It's an area that seems full of cowboys.