Red Seal Insulator (Heat and Frost) Practice Exam

How does moisture affect the performance of insulation?

1. It enhances its effectiveness

2. It has no effect

3. It can reduce insulation effectiveness

4. It improves fire resistance

The correct answer is: It can reduce insulation effectiveness

Moisture can significantly impact the performance of insulation materials, primarily by reducing their effectiveness. When insulation becomes damp or wet, it loses its ability to resist heat flow, as water conducts heat more efficiently than air. This reduction in thermal resistance can lead to increased energy costs, decreased comfort levels in a building, and potential for condensation issues that may promote mold growth. Furthermore, certain types of insulation materials, such as fiberglass, become compressed and lose their insulating properties when they absorb moisture. This reduction in effectiveness can compromise the overall energy efficiency of a building and lead to structural issues over time if moisture is not managed properly. Ensuring that insulation materials are protected from moisture is crucial for maintaining their intended performance and longevity.