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R- 7.8 , 2-in x 4-ft x 8-ft Faced Polystyrene Board Insulation

Perma "R" Products R- 7.8 , 2-in x 4-ft x 8-ft Faced Polystyrene Board Insulation

4.5
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I live in Minnesota and I get cold very easily and am wondering what this product is rated for temperature wise like how cold is this good to ?