Alabama Contractors License Practice Exam

In Climate Zone 3, what is the required U-factor for a curtain wall?

1. 0.5

2. 0.6

3. 0.7

4. 1.2

The correct answer is: 0.6

In Climate Zone 3, the required U-factor for a curtain wall is established based on energy efficiency standards designed to minimize heat transfer and improve thermal performance. The U-factor measures the rate of heat transfer through a building element; lower values indicate better insulating properties. A U-factor of 0.6 is specified in this context because it strikes a balance between energy efficiency and building performance for the climate characteristics found in that zone. Climate Zone 3 experiences a moderate climate, which necessitates effective insulation without being overly stringent to maintain construction feasibility and economic viability. While other values provided, such as 0.5, 0.7, or 1.2, do not align with the established guidelines for this climate zone, the specification of 0.6 reflects an appropriate energy standard that considers both energy conservation and the practical realities of construction. It's important for contractors to stay abreast of these specifications to ensure compliance with local building code requirements and to promote sustainable building practices.