House was built in '64. We live in climate zone 5A, though on the edge of 4A (might be 4a in a few years). We opened up one wall during a kitchen reno and found R13 fiberglass. But it's starting to seperate from the kraft paper, and the paper itself is starting to fall apart. We would like to replace all the windows and siding, so figured an external layer of insulation would be a worthy investment. The plan for now is strip back to sheathing, new self adhesive WRB, new windows installed at shearwall, 2-3in eps/roxul based on price, strapping, new siding.
Is it worth densepacking the walls before doing the WRB?