Discussion
A wall of total thermal resistance 0.5 m\( ^2 \)K/W has a U-value of
Answer: B
Correct answer: 2.0 W/m2K
\[ U = \frac{1}{R} = \frac{1}{0.5} = 2.0\ \mathrm{W/m^2K}. \] The U-value and the total resistance are simple reciprocals, so improving a wall means adding resistance and watching the U-value fall - with diminishing returns, since each further increment of resistance buys less.
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