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Those ugly black streaks and dark spots on your roof may look like dirt, soot, mildew, or mold, but what they indeed are is algae. The most common type is called gloeocaspa magma, which is also known as blue-green algae.

Algae growth usually starts as tiny spots which become visible streaks with time. Usually, before you notice, it has been on the roof for about two or more months.

Why does it appear black? Gloeocaspa can create a protective darkly pigmented outer coating that protects the algae from possible damage from UV rays. This is why your roof has those unsightly streaks. While algae can be found on all roofing types, it is usually more common on asphalt shingles.

Why do Asphalt Shingles get Algae?

Algae spores can be brought to your roof by wind and birds, and because they are airborne, they can rapidly spread from rooftop to rooftop in your neighborhood. It is likewise the case for condos, townhomes, and apartment complexes.

To reduce cost, most shingle manufacturers have switched to shingles containing asphalt, mostly made up of fillers such as crushed limestone and fiberglass, which facilitates the growth of algae. The crushed limestone filler is a food source for those algae.

Is Your Roof Algae Dangerous or Harmful?

Roof algae are not dangerous or harmful on its own, but eventually, the algae can cause the protective UV granules covering the roofing shingles to begin to come off by drying them out.

Fungus, which is also airborne, can combine with algae present on your roof to form into lichen. This lichen feeds off both the shingle filler and the algae. Unlike algae, lichen can grow roots, which makes it more difficult to remove than algae.

How do You Remove the Black Streaks on Your Roof

You can easily remove your roof algae by occasionally cleaning your roof. However, you should note that while cleaning your roof yourself is good for its maintenance, it may void any roof warranties or insurance policies you may have.  Always hire a professional roof cleaning company, that specializes in soft washing to remove the black streaks on your roof.

Conclusion

Roof algae can be a displeasing site every time you look at your roof. The black streaks are very unattractive, but with proper and occasional cleaning (once in a year or two), you can keep your roof looking new.

Contact us today at Power Green Clean for a free quote today! (216-839-9274)