Building Materials Exam 2 Practice

Which parameter best describes the U-value measure?

Rate of heat transfer Thermal resistance Thermal conductivity Sound insulation

Correct Answer:

Rate of heat transfer

Explanation:

U-value describes how much heat moves through a building element for each degree of temperature difference. It’s literally the rate of heat transfer per unit area, with units of W/m^2K. That means a higher U-value indicates more heat slipping through, and a lower one indicates better insulation. The U-value is the reciprocal of thermal resistance (R-value), so increasing resistance lowers the U-value. It’s not a measure of the material’s thermal conductivity alone (that’s a property k of the material) and it’s not about sound insulation.

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