Vapor barrier with rock wool insulation in southeastern PA
I’m renovating a 100+ year old house that has plaster on lath on rough cut 2 1/2” x 4” studs at 18” oc. Exterior sheathing is 1×12 pine boards. Lap siding that has been covered with 3/8” foil faced accordion board and vinyl siding.
I’ve removed the plaster and lath, aligned the interior wall surface using 2 1/2” metal studs, foamed the gaps between the sheathing boards and at the top and bottom plates and insulated the cavities with rockwool insulation. I’m wondering what sort of vapor barrier should be used if any.
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