While not immediately damaging they can prematurely age shingles.
Black streaks on my roof shingles.
Here s why algae grows on roofs.
If you re seeing black streaks running along your roof chances are you ve mistaken them for dirt or even mold.
The algae feed off of the limestone within the roof shingles.
The black streaks are also known as black algae or roof mold.
The black streaks running down roofs are actually a hardy algae called gloeocapsa magma.
Algae growth may cause discoloration on roofs resulting in brown or black streaks on a rooftop.
Areas of the country with low humidity have fewer instances of roof streaks while the problem is relatively common in the southeast where it s more humid and warm.
Algae arrive on the rooftop through the air in the form of spores or clumps of cells.
Technically the black streaks on roofs are a form of algae known as gloeocapsa magma.
As the blue green algae.
The black roof stains are caused by a form of algae that has been around for years typically found in the woods on the north side of trees or on exposed rocks.
I am really disappointed the treated shingles didn t work.
Why are there dark streaks on my roof.
What are those ugly black streaks on my roof.
They re actually algae otherwise known as gloeoapsa magma and they are as nasty as they are resilient.
Algae growth on asphalt shingles.
Most black streaks form on the northern slopes of roofs where it s darker and wetter ideal for algae growth.
If you live in a humid area of the country you ve probably seen unsightly dark streaks on asphalt shingle roofs.
The most common type is known as gloeocapsa magma also known as blue green algae.
Over time this algae accumulates developing a black outer coating which causes stains on roof shingles.
But now this black algae is termed a roof shingle algae because of the annoying discoloration on a asphalt shingle roof.
The streaks are caused by a type of algae known as gloeocapsa magma.
Although these dark spots and ugly black streaks on your roof may look like dirt mildew soot or mold what they really are is algae.
This blackish algae creeps it way across neighborhood roofs gradually turning your home s asphalt shingles an ugly dark brown or black.
I covered our asphalt shingle roof about five years ago with white 50 year guaranteed shingles that had algae prevention treatment but now the entire north side of our roof is black with algae i bought the shingles from lowe s in marianna florida.
While the streaks do not cause a great deal of damage they can cause the shingle to age prematurely.
Black streaks on shingled roofs are a common though mysterious sight.
