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Aren the R-Values of cellulose and fiberglass almost that of open cell polyurethane foam?

April 26, 2017CELL Cellulose fiberglass foam polyurethane r-values

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Aren the R-Values of cellulose and fiberglass almost that of open cell polyurethane foam?

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The R-Value of fiberglass and cellulose is 3.5 per inch. Apex open cell is 3.8 per inch. However, an insulation’s R value is a very poor indicator of its performance. “The R-Fairy Tale” written by David South explains the myth best.