What is the best way to insulate a 4” wall cavity on the interior side of a stone house?
I am working on a stone home in Philadelphia PA that was built in 1920. The exterior walls are 20” of stone with 4” studs on the interior with wood lath plaster.
The framing is balloon type . The studs do not have sheething. The concern is if we fill the 4” void with fiberglass insulation or cellulose the stone will pull moisture into the filled cavity and create mold and mildew.
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