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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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Does the “shiny” side constitute a radiant barrier?


When the R-TECH is installed and the silver side faces an open air space-yes. If installed against a surface that has no air space (cement wall)-No. Radiant barriers often can increase the over-all "R" value of a wall assembly.

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