And by wall I mean wall plate. It's possibly rising damp but I don't know why it's only in a couple of places. The concrete was sitting for 2 years before I started building so it's not fresh and wet.
Not easily, I'll maybe try and get my head under but doubt i'll see much through a 25mm gap.
As I say, that cavity was filled with rockwool over the winter and when I pulled it out it was far from sodden (some of them were a touch damp when they went in though) so I doubt it's water coming down the cavity.
The OSB should hiding the slab floor by an inch or so, again I'll try and get in under there tomorrow
that amount off discolouration on timber would equal loads off water in that area visible on a frequent, possibly consistent level over several months to wet and would expect discolouration over a foot or so on visible walls and floor in the area at a minimum ??
if no discolouration is visible away from the timber, then water is far less likely to be the actual cause and more likely chemical interaction in a confined space as a gas interaction will be more restrictive and contained within the void?? but purely a guess??
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