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this post was submitted on 22 Feb 2024
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Behind the green board, behind the OSB, there is a very thick top plate that those beams are sitting on and based on what the OP said to me, that is then framed down to a sill plate also behind the OSB. Nothing on the outside of the OSB is structural and he's actually screwing those 6x6 cm boards into what's behind the OSB. They're using the OSB as a vapor barrier instead of faced insulation like we do and also protecting the studs with that vapor barrier from the interior of the house.
Edit: Truth is, what's funny about OP's wall and the response it's getting is that it's better constructed than most American buildings you could find. We don't tend to put as big a gap between the vapor barrier and the interior heated space and we don't tend to include the studs as protected by that vapor barrier. When we do we use plastic sheeting, not OSB, because that's too expensive. I'd imagine the R value on his insulation is also much higher than ours.