At least with the costs in my area, I don't agree with Chris's argument.
Closed cell is about the same $/R (twice the cost but twice the R) so you can use half the amount if you have reached diminishing returns, or more if you want it in for a given size cavity.
However, closed cell 2"+ is a vapor barrier, adds to the structural integrity of the framing, and is supposed to last better (maintain R value) over time.
I saw these, or others just like these, at the show - they looked great - I was shocked you could pull off this look so well with LED
Can you comment on the clay plaster you used and what issues you had during or after the job? I'm looking at American Clay for a big job but an (excellent) old world plaster sub is knocking its durability and finish. I think he just doesn't like the much lower price I can do clay for.
My finish is intended to be like a Venetian plaster, with a soft (suede) smooth appearance in an off white. This clay plaster is the best option I've come across on paper, but no builder I asked has used it.
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