Red Seal Insulator (Heat and Frost) Practice Exam

How does air sealing improve the effectiveness of insulation?

1. By increasing the density of insulation materials

2. By adding insulation layers

3. By preventing drafts and uncontrolled airflow

4. By improving aesthetic appeal

The correct answer is: By preventing drafts and uncontrolled airflow

Air sealing significantly enhances the effectiveness of insulation by preventing drafts and uncontrolled airflow. When air leaks occur around windows, doors, and other gaps in a building's envelope, conditioned air can escape, while unconditioned air can enter. This air movement reduces the overall thermal resistance of the insulation, making it less effective in maintaining consistent indoor temperatures. By sealing these leaks, the envelope becomes more airtight, minimizing the transfer of air. This allows the insulation to perform closer to its intended R-value, ensuring that the heating and cooling systems work more efficiently and effectively. In essence, when air sealing is properly implemented, it leads to a more stable indoor environment, reducing energy costs and improving comfort levels.