Can spray foam insulation be added to exsisting walls or will it blow the dry wall off the studs?
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simple answer ----- yes
But not the carpenter in a can stuff at home desperate----- it will give a nice bow in the wall.
Now there is a product that I have never seen being installed but have ripped into walls that had it in there.
I would ask these guys http://www.tigerfoam.com/ they seem to be one of the leaders in the industry.