Insulating Outlet/Light Boxes

Discussion in 'Electrical Forum discussion & Blog' started by molo, Nov 9, 2011.

  1. molo

    molo New Member

    Messages:
    840
    Location:
    cold new york
    Are there any techniques that can be recommended for reducing the draft in a outlet/light boxes (specifically a box with 3 light switches?)

    Thanks,
    Bill
  2. Furd

    Furd Engineer

    Messages:
    446
    Location:
    Wet side of Washington State
    Retrofit is difficult but in new construction use tape to close off all the holes in the box and some spray foam or caulk to seal the wire penetration. Use some siliconized latex caulk to seal between the edge of the box and the drywall.
  3. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,806
    Location:
    New England
    They sell inexpensive foam pieces designed to fit over the switch or receptacle. For multi-gang ones, you can overlap them. They'll help with the breeze.
  4. molo

    molo New Member

    Messages:
    840
    Location:
    cold new york
    Is Spray foam in the box OK?
  5. jwelectric

    jwelectric Electrical Contractor/Instructor

    Messages:
    2,529
    Location:
    North Carolina
    no .
  6. cacher_chick

    cacher_chick Test, Don't Guess!

    Messages:
    3,236
    Location:
    Land of Cheese
    If you are really motivated, you might consider opening up the wall to see where all that air is coming from. You may have a big leak or the insulators could have "missed" a stud bay.
  7. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,253
    Location:
    Cave Creek, Arizona
    Usually the problem is "OUTSIDE" the box and needs insulation around it.
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