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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

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Can this be used to insulate the ceiling and walls of a wood storage shed in the New England seacoast region? Want to avoid mildew, extreme cold, etc.