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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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Do you have to put it in between the 2x4s or can you just put it on top of 2x4s and nail/glue it on the inside of a well house.