What can excessive insulation lead to?

Excessive insulation can lead to potential overheating and increased humidity levels because when insulated spaces are overdone, they can trap heat and moisture. In properly insulated areas, insulation helps maintain temperature; however, when there is too much insulation, it can hinder proper airflow and ventilation. This lack of ventilation not only prevents excess heat from escaping but also allows humidity to build up, which can create an uncomfortable climate and lead to mold growth and structural damage over time.

In contrast, the other options do not accurately reflect the consequences of adding too much insulation. While increased energy efficiency is a benefit of adequate insulation, it does not address the risks that accompany excessive amounts. Structural instability is typically a concern in situations involving inappropriate materials or methods of installation, rather than just the quantity of insulation. Lastly, air quality improvement is generally linked to improved ventilation and airflow, which can be compromised in cases of excessive insulation due to trapped moisture and contaminants.