Which one of the following is NOT a component of improper mitigation that can cause structural issues?

The answer reflects the understanding that properly installed HVAC systems are crucial to maintaining adequate indoor air quality and ensuring proper ventilation, consistent temperature, and moisture control within structures. Proper installation means that these systems function as intended, contributing positively to the performance and safety of the building rather than causing structural issues.

In contrast, engineered wood products, sawn lumber floor joists, and improper ventilation methods can potentially lead to structural issues. Engineered wood products can be susceptible to moisture and may require specific installation techniques to avoid future problems, while sawn lumber floor joists can warp or sag if not installed correctly or if they are subjected to excessive moisture. Improper ventilation methods can cause moisture buildup, leading to mold growth and structural damage over time. Therefore, having an effectively installed HVAC system is a safeguard against the potential issues that improper mitigation of these other components could pose.