Step 1: Cut to Width

man cutting insulation batting
Photo: Ryan Benyi
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For narrow stud bays, you have to trim down the batt's width. To do that, lay a batt on the floor in front of the cavity, as shown, and line up one edge with the inside face of the stud bay. Then lay a straight 2x4 in line with the inside face of the neighboring stud and press down on it with one knee. Run a utility knife alongside the 2x4, trimming the batt with a series of shallow cuts.
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    Tools List

    • gloves
      gloves
    • dust mask
      dust mask
    • straightedge guide
      2x4 straightedge
    • utility knife
      utility knife
    • staple gun
      staple gun or hammer tacker
    • caulk gun
      caulk gun

    Shopping List

    1. Batt insulation
    to match the depth of the stud. To estimate how much you need, measure the square footage of each wall and subtract 10 percent.

    2. Vapor retarder
    to estimate how much you need, measure the square footage of the wall and add 5 percent.3. Silicone Sealant