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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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DOSE IT MAKE A DIFFERANCE WHITCH SIDE FACES INTERIOR, LIKE FOIL SIDE ?


the foil side goes towards the dead air space,

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