Question: 1 . 7 3 Estimate the R - values for a 5 - cm - thick fiberglass board and a 2 . 5 - c

1.73 Estimate the R-values for a 5-cm-thick fiberglass
board and a 2.5-cm-thick polyurethane foam
layer. Then, compare their respective conductivity-
times-density products if the density for fiberglass is
50kgm3 and the density of polyurethane is 30kgm3.
Use the units given in Figure 1.31.
1 . 7 3 Estimate the R - values for a 5 - cm -

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