U-values Flashcards
1
Q
What are U-values?
A
U-values measure how effective a material is an insulator. The lower the U-value is, the better the material is as a heat insulator. For example, here are some typical U-values for building materials:
a cavity wall has a U-value of 1.6 W/m²
a solid brick wall has a U-value of 2.0 W/m²
a double glazed window has a U-value of 2.8 W/m².
The cavity wall is the best insulator and the double glazed window is the worst insulator. Note that you do not need to remember any U-values for the exam or know the equation used to calculate U-values.
