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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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I recently asked if putting this on gar ceiling would help keep floors above gar warm. 1 tech expert replied yes while another said no. Anybody else?