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WebJan 7, 2024 · Foam board insulation is easy to use and is a great DIY way to add some insulation. It comes in standard-size 4×8 sheets, and … WebNov 22, 2010 · Adding 2" foam to the interiors of 2x4 studs to be able do accommodate rock wool R23s or cathedral-ceiling R21-22 fiberglass works. You'll still need ot use air tight methods on the gypsum, and a "smart" vapor retarder like Certainted MemBrain or Intello Plus under the gypsum to protect the sheathing. shareef\u0027s grill baltimore md
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