North Carolina Building Contractor License Practice Exam

What does the term "R-value" refer to in building insulation?

1. Fire resistance

2. Thermal resistance

3. Sound resistance

4. Moisture resistance

The correct answer is: Thermal resistance

The term "R-value" specifically measures thermal resistance in building insulation. It indicates how well a building material can resist the transfer of heat. A higher R-value signifies better insulating properties, meaning the material is more effective at keeping heat inside during the winter and outside during the summer. This principle of thermal resistance is crucial for energy efficiency in buildings, as materials with higher R-values can contribute to reduced energy consumption for heating and cooling, ultimately leading to lower utility bills and improved comfort for occupants. Understanding R-values is vital for contractors and builders when selecting insulation to meet energy codes and standards within North Carolina and beyond.