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Posted by on Monday, November 23, 2009 at 10:35pm.

The ceiling of a single-family dwelling in a cold climate should have an R-value of 25. To give such insulation, how thick would a layer have to be if it were made of each of the following materials?

(a) polyurethane foam (thermal conductivity k = 0.024 W/m ยท K)

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