My wife and I just purchased an old house. The walls are in terrible shape, so we plan to replace the plaster and lath with beadboard and drywall. But when we pulled the lath off the outside walls, we found more plaster and lath between the studs. It effectively creates a channel on the inside of the bay. We want to insulate the walls (there is blown-in cellulose on the outside of the bay, but it can’t be much), but I don’t know if taking out the stuff will affect the structural stability. Should I take this out and block the walls? Should I settle for adding a little rigid insulation (3/4 inch) between the studs? What is the purpose of the plaster and lath inside the studs?
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