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Posted by Art on December 2, 2007, 12:05 pm
Brian wrote:
> I have a deep 3 gang box on and exterior wall. There is cold air that pours
> out of it since I am guessing not much insulation could be put behind it.
> Is it safe to fill the gang box with fiberglass insulation?
Fiberglass insulation will do nothing to stop air infiltration and it is
useless as long as air is leaking through or around it. The best
solution is to find where the air is leaking into the wall cavity and
seal it there. If you can get above and/or below the wall to where the
electrical goes through the header and sill plates and shoot some
expanding foam in all the holes the electrician created it will probably
solve your problem.
If you can't do that then use a switch plate gasket. Stopping the air
from exiting the wall cavity should also stop the air from entering it.
That will allow any insulation that is in the cavity to do it's job.
--
Art
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