LEED AP with Operations and Maintenance (O+M ) Practice Exam

How often should a high-reflectant roof be cleaned for the roof under Heat Island Reduction credit?

1. Once a year

2. Every 2 years

3. At least once every 3 years

4. Every 5 years

The correct answer is: At least once every 3 years

For a high-reflectant roof to effectively contribute to the Heat Island Reduction credit under the LEED O+M rating system, it is recommended to maintain its cleanliness on a regular basis. This maintenance frequency helps ensure that the roof retains its high reflectance properties, which is crucial for minimizing the heat absorption of the building and therefore reducing the urban heat island effect. Cleaning the roof at least once every three years is a practical approach that balances maintainability and effectiveness. This interval allows for sufficient time to pass for dirt, debris, and other materials to accumulate, which can diminish the roof's reflectivity. Regular cleaning helps in sustaining the roof's performance in reflecting solar radiation and is essential for achieving the energy savings and sustainability goals associated with high-reflectant roofing materials. In this context, while other options may propose varying frequencies, the three-year interval stands out for its emphasis on ongoing maintenance without overburdening the maintenance schedule, encouraging consistent roof performance.