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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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What would be the best way to attach under a peir and beam home with 2x8 floor joists and no insulation? Would I need to leave an air gap?


I would cut panels to fit between floor joists. Attached with adhesive and or fasteners. Don't think an air gap is necessary.

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