West Virginia Contractors License Practice Exam

What is the R value insulation requirement for a residential floor in climate zone 3?

1. 13

2. 19

3. 21

4. 24

The correct answer is: 19

In climate zone 3, the R-value insulation requirement for a residential floor is set at 19. The R-value measures the thermal resistance of insulation materials, indicating how effective they are at preventing heat transfer. For residential buildings, this requirement takes into account factors such as energy efficiency and climate conditions specific to that zone. In climate zone 3, which typically has a moderate climate characterized by warm summers and mild winters, an R-value of 19 for floor insulation helps maintain energy efficiency while providing adequate thermal comfort for occupants. This ensures that homes remain energy efficient and comfortable throughout the year, helping to reduce heating and cooling costs. Other R-value options listed, such as 13, 21, and 24, exceed or fall short of the optimum insulation level needed for balancing energy efficiency with construction practicality in climate zone 3 specifically.