I don't think you use "Great Stuff", but they do make DIY insulating
foam kits to do just what you're suggesting. Looks like a large Freon
tank and some hoses and a Tyvek suit.
I might not understand, but if you've got the wall completely open, I'd
use the foam, either you doing it or hiring someone. If it over-expands,
they just 'shave' it off flush with the studs. Various kinds of foam
have different issues--some are incredibly toxic if they catch fire,
some are fire resistant, some 'settle' or compact and lose R-value over
time more than others, but I think any of them could be must better in
your application than fiberglass.
This is all from memory of a Fine Homebuilding magazine article a year
or two ago. I can try to dig it up if you'd like.
Scott
On 2/21/2012 6:17 PM, Karl Vacek wrote:
> The idea of foaming the whole wall is very appealing - it'll provide
> insulation and seal the many air leaks. Now, I can stick my hand out around
> the windows with the trim off. I've seen (maybe This Old House) people just
> foam into the cavities of an old house, right onto the inside of the
> sheeting and the studs, with no other preparation. I could easily do that
> with a few cans of polyurethane foam from the big box store. Is that a
> legitimate way to approach this?
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