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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.
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It's partly cowboys, partly very difficult to diagnose. There are times if you are working on a house for years that you find causes while you are sorting other things when you've had people look at the symptoms and scratch their heads for years.
Anyone who says they can come in and solve all damp problems is probably a cowboy or they've been working in the business 150 years.
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.