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1. Mineral Wool, 2. Fiberglass Batt, 3. Dense Pack Cellulose, 4. Closed Cell Spray Polyerthene Foam In North America, wood framing is the most common method for exterior wall construction. These wood framed walls are built with 2x6 studs, (1.5"x5.5") spaced not more than 16"-24" on center. The spaces between each stud are called "stud bays" or "cavities" and these cavities must receive insulation. As a home owner looking to renovate or build a new house, you should have an