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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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If this is used under a 4" slab, do you also need a separate polyethylene vapor barrier, or because it is faced can you just tape the joints?