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Very useful, thanks. I will assume it originally vented at the step down.
My preference is to break out the concrete and replace with a new insulated raised timber floor but I imagine that would be quite fiddly and expensive.
hoefla-
It looked like there was one there at some point, but had been boarded over.
One of the previous owners seems to have been a little obsessed stopping drafts. The old in-room vents were stuffed with cotton wool and painted over. Every gap around the floor and skirting is full of silicon, there's bits of expanding foam all over the place. A wall vent in the kitchen has a sheet of paper stuck over it and has then been painted over (this is not a papered wall). The list goes on...
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If YouTube gosforth handyman hes done exactly what you said minus the insulation. You might need a ledger board so you can plant the joists hangers onto
atk
musa
Yes.
There's been a large gap there since we redid the living room floor. Will be putting a generous vent as kitchen is redone. Previously very damp in that corner, seems fine now.
It did while it was drying out initially but seems to have gone. You get the odd whiff of damp in the morning when it's been really wet out for a few days, but that could just as easily be from the poorly fitting cellar door (house is 1890s, no DPanything under floor or in cellar, just dirt and bad concreting). Kitchen itself is well ventilated, some days you can feel quite the breeze from under the step, very reassuring. We have a fair few spiders around an about the house, can't say there's more or less since we opened that up. No sign of anything else crawling about though.