Apogee was called to this Atlanta area apartment complex to address the issue of black roof staining caused by algae (Gloeocapsa magma). Beyond the cosmetic advantages of roof cleaning, there are the numerous structural advantages. However care must be taken when cleaning asphalt roof shingles to avoid the breakdown of the shingle itself and reduce its lifespan instead of increasing it as is intended. Apogee uses only chemicals that have been determined to be "roof safe" and employs practices that result in a clean roof without compromising the shingle integrity.