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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 is the difference per your Specifications between Maximum R-Value 7.7 and R-Value per Inch 3.85


they are the same - 2" thick product is 7.7 - 3.85 x 2 = 7.7

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