40 Hour Property and Building Inspection Practice Test

What are the consequences of insulation that is wet, compressed, or has gaps?

1. Increased R-value

2. No significant issues

3. Heat loss and ice damming

4. Improved energy efficiency

The correct answer is: Heat loss and ice damming

When insulation becomes wet, compressed, or contains gaps, it significantly hampers its effectiveness in maintaining thermal resistance, which is quantified by the R-value. Wet insulation loses its insulating properties as water conducts heat much more efficiently than dry materials. Similarly, compressed or improperly installed insulation does not trap air as effectively, reducing its effectiveness. These conditions lead to heat loss in the winter when warm air escapes from the building, and in the summer, it can allow hot air from outside to infiltrate the interior spaces. This can result in increased energy usage for heating or cooling, subsequently raising utility bills. Additionally, in cold climates, the combination of warm air escaping and cold air entering can lead to the formation of ice dams on rooftops due to the melting and refreezing of snow, creating potential damage to the roofing structure and gutters. Therefore, the proper conditions for insulation are crucial to prevent such heat loss and associated problems.