Updated: Dec 26, 2020
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. The most common type is known as gloeocapsa magma—also known as black algae.
This algae growth usually begins as small spots and then eventually becomes visible streaks. By the time this algae is noticed by the homeowner, it has usually been on the roof at least two or more months.
Why does this algae appear to be black? Gloeocapsa has the ability to form a protective darkly pigmented outer coating that shields the algae from damaging UV rays. This is what makes those unattractive black streaks on your roof!
Although algae can be found on all types of roofing, it tends to be most common on asphalt shingles. Asphalt shingles are composed of limestone and the algae is feeding off the limestone. Eventually as the limestone is removed from the shingles they will begin to deteriorate.
HOW DO YOU GET RID OF THE BLACK STREAKS?
Soft washing is the only effective way to remove the bacteria without harming your roof shingles.
A simple roof cleaning with the proper CLEANING AGENTS used by Advanced Exterior Maintenance can safely remove those streaks for you. To see the results of the roof cleaning process please visit our website at http://www.advancedxm.com