How do you attach a large amount of insulation to a concrete wall?
The house I am building in zone 5a will have concrete walls (2 story) for high thermal mass. I would like the walls insulated to R-30, but am concerned about how to attach so much insulation. Will 5 inches of polystyrene get me to a R-30 and how will it attach to the walls? Is there a better way to insulate concrete?
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