Black Streaks On My Roof

Black streaks on shingled roofs are a common though mysterious sight.

Black streaks on my roof. I tried this product on the north side of my roof about two months ago. There were visible dark streaks that made me think i needed to replace my roof to improve the appearance of my house. 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. Why you re seeing black spots or streaks.

Many home owners are surprised to discover that the once clean asphalt roof shingles have been slowly covered with a form of roof mold or mildew that appears as a light discoloration and spreads down the roof toward the gutters. Black streaks on the north and west facing and shaded areas of your asphalt shingled roof can really wreck the appearance of your home. Roof is now 8 years old. In about two weeks i noticed a significant improvement in the roof and a week or so later i would say 75 of the streaks were gone.

Technically the black streaks on roofs are a form of algae known as gloeocapsa magma. While the streaks do not cause a great deal of damage they can cause the shingle to age prematurely. The streaks look like mold but they re actually algae colonies that form in your shingles and feed on moisture and the limestone filler agents in the shingles. My new owemins corning roof started turning black from original grey color 5 years ago.

A roofing contractor just tried to sell me a new roof for 10 700. Believe it or not those black streaks only appear on roofs in certain areas of the country. The black streaks are also known as black algae or roof mold. What are the black streaks on my roof.

Algae may be mistaken for soot dirt or tree droppings most of which typically produce only localized discoloration. Over time this algae accumulates developing a black outer coating which causes stains on roof shingles. As the blue green algae. Algae growth on asphalt shingles.

The algae feed off of the limestone within the roof shingles. Those that tend to be the most humid furthermore they will only appear on the north side of the roof. You ll typically see gloeocapsa magma forming on areas of your roof that don t receive direct sunlight. Algae growth may cause discoloration on roofs resulting in brown or black streaks on a rooftop.

Here s what they are and what to do about them. Once the algae have infested your roof you ll see black spots begin to form. While not immediately damaging they can prematurely age shingles. The black streaks running down roofs are actually a hardy algae called gloeocapsa magma.

Why are there dark streaks on my roof. The black roof stains are caused by a form of algae that has been around for. The streaks are caused by a type of algae known as gloeocapsa magma.