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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 have a garage with a sheet metal roof. Can I glue this directly to the sheet metal? Does foil go against the sheet metal or face into the garage?