How to Caulk Electrical Boxes


Airtight electrical boxes that are sealed with caulk complete an air barrier. The pipes where cables pass through also need to be sealed before the wall is closed up. After all this has been done, the area is sealed from expensive drafts. For example, a draft at 7 miles per hour inside the insulation cavities can degrade the R-value of fiberglass insulating material as much as 40 percent.

Things You'll Need

  • Clean rags
  • Utility Knife
  • Caulking gun
  • Siding and window sealant
  • Putty knife
  • Insert the siding and window sealant caulk into the compartment of the caulking gun.

  • Make a ¼-inch "bead" by cutting off the tip using a utility knife.

  • Caulk the open seams around the electrical box. Stop the flow of caulk, and wipe the tip clean with a wet towel.

  • Make a uniform surface by pushing the bead of caulk into the seam using a putty knife or finger, watch for sharp corners, so using a putty knife would be best.

  • Clean any excess caulk from around the box using a lightly wet rag.

Tips & Warnings

  • Use a color to match or use a clear caulk if a color cannot be matched.

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