Alabama Contractors License Practice Exam

What is the required U-factor for curtain walls in Climate Zone 3?

1. 0.4

2. 0.6

3. 0.7

4. 1.0

The correct answer is: 0.6

The required U-factor for curtain walls in Climate Zone 3 is 0.6. This value reflects the thermal performance required for building elements in this climate zone, which includes areas where moderate heating and cooling demands exist. The U-factor measures the rate of heat transfer through a building component; thus, a lower U-factor indicates better insulating properties. Curtain walls must meet these standards to enhance energy efficiency and maintain comfortable indoor environments. In Climate Zone 3, which typically involves a mixed-humid climate, the standard of 0.6 is designed to balance energy efficiency with comfort, ensuring that buildings can effectively manage heat loss in winter and heat gain in summer. This requirement aligns with building codes and energy efficiency programs that aim to reduce energy consumption in commercial and residential structures. Understanding these factors helps in selecting appropriate materials and designs that comply with energy codes, ensuring both comfort and sustainability in construction.