Step 3: Deal with Obstacles

man installing batt insulation
Photo: Ryan Benyi
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For wires, halve the batt's thickness by pulling it apart. Then slide one half behind the wire and lay the other half in front. For electrical outlet boxes, install the batt, then cut a notch in its edge, using the box as a guide. For plumbing supply pipes, work the full thickness of the insulation behind the pipe to help prevent it from freezing.
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    More in Framing & Insulation

    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