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I set 2" foil faced polyisocyanurate (Dow Tuff-R) on the inside walls of my basement, simply by attaching it with three" Faucet-it concrete anchors and taping the seams with foil tape, you'll need a hammer drill to produce the holes while in the concrete. I also pieced the polyiso into just about every rim-joist bay and sealed the sides and seams w