How to Use Great Stuff Foam in Electrical Boxes

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Great Stuff Foam is a type of spray insulation that is used for many different applications. It is most commonly used to fill gaps and cracks around doors and windows. It also helps seal around pipes and electrical outlets. This insulation is sprayed through a small hose and expands where it is sprayed to fill up any gap. Great Stuff Foam insulation is excellent to have around the house for a number of different applications.

Things You'll Need

  • Phillip-head screwdriver
  • Utility knife
  • Turn off the main electrical circuit breaker switch to the area of your home where you will be spraying the Great Stuff insulation. Locate the outlet box and remove the cover plate with a Phillips-head screwdriver. Turn the screwdriver counterclockwise to remove the screws from the cover.

  • Locate the holes between the drywall and the electrical outlets. Check for gaps between the wall and the metal or plastic box that has the electrical socket.

  • Pull the plastic top off the can and attach the clear spray hose to the nozzle. Position the hose between the drywall and the electrical box. Push down on the button and spray the Great Stuff around the outside of the electrical box.

  • Work all the way around until the gap has been completely covered. Wait eight hours for the foam to completely cure, and trim off the excess with a utility knife until the foam is flush with the wall.

  • Reattach the outlet cover and secure it in place with the screws. Turn the power to the outlet back on.

Tips & Warnings

  • A flat-head screwdriver may be necessary to remove the outlet cover depending on what type it is.
  • Do not get any foam into the electrical box itself.

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