I'm insulating my office with R13 batts on the walls and R30 batts on the
I have 22 electrical boxes on the insulated walls and these boxes will
create voids in the wall insulation.
There is however about 3/4" of space between the back of the boxes and the
exterior sheathing so I am thinking about cutting sheets of styrofoam to the
size of the boxes and putting it behind the boxes.
This will do 2 things.
Eliminate that void in the wall (thermal break).
And I could get rid of some of this styrofoam packing material that was in
our fireplace shipping box.
Is it a good or a bad idea?
(an alternative is to use some of the waste batts (scraps) to *stuff* behind
Good idea. Up in these parts, we frame w/ 2x6 so we can get enough
insulation in. In fact, it's code to use exterior "vapor barrier" type
boxes, with gaskets on 'em, then you tape the interior vapor barrier to
it. Stupid system, really....
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