The black spots on a roof could be Gloeocapsa magma. It's an alga that feeds on various shingle materials and generates long-term damage. The black organic substance doesn't just make the roof unsightly, but it also reflects heat and reduces your house's ability to maintain heat. As a result, you will use the heating system more often than before and you will pay high energy bills. Our Roof Cleaners are experts in removing the black spots from your roof as quickly as possible. Our methods are efficient and we can change your roof's whole appearance for the better.