The black streaking on your roof is a type of algae called Gloeocapsa Magma. This intrusive algae feeds on the limestone filler in your shingles and grows and darkens until treated. It is spread by wind and animals from roof to roof and almost impossible to prevent. Without treatment these algae will take years off the life of your roof, along with reducing property value and curb appeal.
Our services will remove these costly stains and keep them away for 3 years or longer. However, depending on environmental conditions, northern exposure, algae spores from neighboring houses and/or animals, they may come back sooner.