Why Are There Black Streaks on My Roof?


The roof of your home is important because it provides protection as well as an aesthetic appeal for the passersby to gaze upon. Sometimes the roof can run into problems that require certain maintenance to be performed. One common problem that many roofs run into is black streaking and stains.

What are Black Streaks?
The black streaking you see on your roof is actually a buildup of algae. Roof algae, also known as Gloeocapsa, is attracted to your roof because it will feed on the limestone minerals found in certain types of shingles. You may not notice the algae at first, but over time a buildup will form and it will appear as a less than flattering black streaking or stain.

How to Remove Black Streaks
Grab a ladder, a scrub brush, and some stain remover from the store and make your way up to the roof. Once you are safely on top of the roof, begin spraying the stain remover on all of the affected shingles. Let the stain remover works its magic for roughly fifteen minutes and then lightly scrub all of the algae infested shingles. Afterwards, thoroughly rinse off the roof with a garden hose.

How to Prevent Black Streaks
The first, and most obvious, prevention measure is to install shingles that are resistant to algae. If you do not have these shingles and your roof is relatively young and in good shape, look to add copper or zinc strips and galvanized flashing. The strips will emit an anti-algae solution each time it rains and the flashing will release metal particles that are toxic to algae. Neither will rid your roof of its current algae, but they can prevent future algae from forming.

Black streaks on your roof can make even the nicest of homes look far less appealing than they should. Whenever you need professionals to help clean, repair, or replace your roof, contact the expert installers at Preferred Exterior. To learn more, or to schedule a free estimate, give us a call at (516) 354-7252.

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