And might give the OP in the 'Ground level & damp question' thread a hint as to what to try first.
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8 years ago
Ground level & damp question
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8 years ago
Just to follow up, I scraped up all the moss off the path to reveal a concrete layer that's actually in good condition and "haunched" up the house wall all the way along, except for about three foot at the end that developed damp. (Much easier to see this without the weeds and moss!)
I can't work out why that end has never been haunched but it seems likely that any sitting water is percolating down between the path and the wall at this point.
On closer inspection, the entrance to the air vent actually has quite a reasonable slope to shed water so I don't think that it is an issue.
Tim