Insulating plaster/lath walls with double wall in a bathroom
I have an old Maine house with minimal wall insulation and plaster and lath walls. I am in the process of adding cellulose to the attic to R60 but wonder about the walls.
Specifically, in the bathroom since there is one stud bay that I know has vermiculite in the wall but the rest of the bays are empty. Could I simply build a new interior 2×6 wall and insulate with cellulose and leave the plaster walls alone? I don’t want to disturb the vermiculite, or pay the cost to get rid of it. Would this double wall, one insulated, one not, cause any problems?
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