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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
279
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Need to verify; is this recommended for use on interior garage ceiling (drywall) to help keep wood floors in bedrooms above garage warmer in winter?