The black stains on the roof of your home are not just stains. It is a fungus known as Gloeocapsa Magma. It will start forming on the north side of the roof and spread slowly over time. As the bacteria accumulate the stains become darker. If left untreated the growth can accumulate more moisture within the shingles causing aging, rotting and loss of shingle grit. We can safely remove the fungus and stains with a low pressure treatment. This method will not cause any damage to the roof. We do not use any pressure. All plants and vegetation will be unharmed during the process. If you have gutter guards we guarantee the warranty but require the roof and gutter guards to be blown off and cleared of debris at least once a year.