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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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Will I receive double the "R" value with two overlaping layers of the sheating?


The R value is additive. EPS has an R value of just under 4 per inch.

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2 " is R-10, 4" is R-20 and so on, the more, the better.

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