Insulation a thin wall (block)
I'm involved in a water damage repair involving replacement of soggy drywall and insulation (little mold). These same outer walls, one above the other have turned out to have extra thin cavities (3/4 furring over block on the upper two floors, and 2x4 studs turned on their side on the lowest floor, which is partially below grade.
We replaced about 4 to 8 linear feet of water-logged lumber on each floor.
Building thicker walls is not in the cards, so what can be done about the insulation? I am considering 1 1/2" xps in the basement floor cavities, cut to fit, with all gaps foamed. On the upper floors, I only have 3/4" depth, which means same thing, but with 3/4" xps. Then I'm going to foam all the gaps. No other vapor barrier, then close it up.
Thoughts on this plan of attack?