Insulating in a tight space
I found a way to insulate my uninsulated brick wall from above. I live in climate zone 5.
My 1st floor is 3.5″ deep brick exterior with a 1″ cavity then 3.5″ cmu. Attached to that is 3/4″ furring strips(the kitchen wall has 3.5″ stud bays) Then 1/2 gypsum nailed to that with approximately 1/2″ of plaster skimmed to the wallboard painted.
So I have thought of blowing in insulation from the top down since I have access now. Beside cellulose or fiberglass do I have any other options?
However I have no reasonable way of creating a proper air barrier. What issues will this pose. If any?
Am I better off leaving it as-is or will I see any reward from trying to add whatever r value I can?
Also what would be a good way to create an air barrier at the rim. The first is my original 2×8 Doug fir joist and the second is my new framing 9.5″ I joist. I have thought of doing a cut and cobble with foam board. Is there an easier way?
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