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Posted by Matt Whiting on December 2, 2007, 8:53 am
HerHusband 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?
>
> I don't know the regulations, but my gut feeling says it wouldn't be safe
> to fill the box with insulation. Instead, I would remove the
> outlets/switches, and break away a few tabs on the back of the box, then
> spray minimally expanding foam behind the box. After it has finished
> expanding, cut or break away any insulation that is in the box, and caulk
> around the openings and where cables enter the box. I'd also caulk around
> the outside of the box where it meets the sheetrock/wall covering.
> Reinstall devices, put on the cover plate, and you should be good to go.
And then place a foam gasket under the cover. This won't block all of
the air, but it will block most of it. I don't know of a safety issue
with regard to fiberglass insulation inside the box, but it likely won't
be very effective and will really annoy the next electrician who works
on that outlet.
Matt
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