WHAT ARE THE LINES ON MY ROOF?

Often mistaken as mold or mildew, the black discoloration and streaks visible on many roofs in Georgia is actually algae or Gloeocapsa Magma. Due to the humid climate we have in Georgia, Gloeocapsa Magma produces a blue green algae which looks like black streaks and protects itself from damaging ultraviolet rays by producing a dark pigment sheath. By the time the algae is visible, it has likely been present for several months. Not only are the dark lines not great for curb appeal, the algae will undoubtedly have a negative impact on cooling your home. That is why it is important to address an algae problem as soon as possible.