Black Stains On Roof Shingles

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Black stains on roof shingles.

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. 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. The most common type is known as gloeocapsa magma also known as blue green algae. Your stains are probably caused by the airborne spores of a blue green algae known as gloeocapsa magma which is often mistaken for mold or mildew.

This algae growth usually begins as small spots and then eventually becomes visible streaks. Technically the black streaks on roofs are a form of algae known as gloeocapsa magma. The black streaks running down roofs are actually a hardy algae called gloeocapsa magma. Dark black or brown roof shingle stains are often caused by black algae bleed through or extractive bleeding of asphalt dirt soot or organic debris.

Here s why algae grows on roofs. As the blue green algae accumulate they develop a dark hardened outer coating which results in the black stains you see. The streaks are caused by a type of algae known as gloeocapsa magma. How to remove and prevent black algae stains on asphalt shingle roofs today s homeowner find out how to remove unsightly black stains from asphalt shingle roofs caused by an algae known as gloeocapsa magma that is spread by airborne spores.

While the streaks do not cause a great deal of damage they can cause the shingle to age prematurely. When that happens it is generally caused by mildew algae mold or dirt stains. It is not uncommon for roof shingles to turn black over time. Black streaking on roofs is a common problem.

If you live in a humid area of the country you ve probably seen unsightly dark streaks on asphalt shingle roofs. But now this black algae is termed a roof shingle algae because of the annoying discoloration on a asphalt shingle roof. Remove black stains from roof shingles to preserve the appearance of your home s roof. The black streaks are also known as black algae or roof mold.

But there are other roof stain colors and causes. These black streaks are unsightly and can diminish the appearance of the entire exterior of the home. Over time this algae accumulates developing a black outer coating which causes stains on roof shingles. While doing little harm to your shingles the black streaks caused by the algae are unsightly.

The algae feed on the limestone in shingles. Algae can be killed and the stains removed using chemical cleaners though they usually return over time.