What causes dark streaks on roofs?

What Makes the Streaks? The black streaks running down roofs are actually a hardy algae called Gloeocapsa magma. As the blue-green algae accumulate, they develop a dark, hardened outer coating, which results in the black stains you see. The algae feed on the limestone in shingles.

What do black streaks on roof mean?

Those black streaks on your roof shingles are most likely an algae called gloeocapsa magma, or as it is more commonly referred to, a blue-green or black algae. Algae is a solid deposit of spores and dirt, another form of mold. … Do NOT pressure wash your roof; one wrong angle and you can damage the shingles.

What causes dark stains on roof?

Roof experts say black streaks are caused by an algae known as gloeocapsa magma. Airborne spores deposit it on your roof, where it soaks up plenty of sunlight for photosynthesis and munches on the limestone filler in your shingles. … Humid areas of the country are most susceptible to dark streaks from algae.

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What does discoloration on a roof mean?

If you have dark streaks or discoloration on your roof shingles, it’s most likely because you live in a high humidity area (like Florida). Those dark streaks and discoloration are caused by a blue-green algae called Gloeocapsa Magma.

How do you clean roof streaks?

The less expensive solution is to spray wash the roof with a 50 percent mix of water and bleach to get rid of the algae. (No pressure washers, please. They’re likely to damage the shingles.) Just be sure to wet your foundation plantings first, and rinse everything in clean water when you’re done.

How do I remove black streaks on my roof?

If the streaks don’t bother you or you’re not ready to invest in a new roof, install zinc or copper strips (available at roofing centers) along the top course of shingles. When rain hits the strips, it produces a solution that runs down the roof and keeps algae, moss and fungus from growing.

What is the best cleaner for roof shingles?

of laundry strength liquid chlorine bleach and water. This is the best way to clean a roof if you have asphalt shingles. After spraying the roof with the mixture, allow it to sit on the surface for 15 to 20 minutes before rinsing thoroughly with clean water.

How can I make my roof look new?

Here are five tips to help make your roof look younger and better this spring!

  1. Clean Away Debris. Gutters full of needles and shingles covered with leaves don’t impress anyone. …
  2. Get Rid of Algae and Mildew. …
  3. Install New Gutters. …
  4. Repairing Edges and Eaves. …
  5. Replace Shingles with Better Colors.
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Is it safe to pressure wash a roof?

NEVER aim your pressure washer up the roof, as it can push water under the shingles. Spraying water under your shingles can both tear off the shingles and force water under them and into your home. … You shouldn’t have to pressure wash your roof any more than once every year or two at most.

Why is my roof stained?

Black stains on an asphalt roof caused by algae. … Though often attributed to an accumulation of dirt, defective shingles, mold, or mildew; the most common culprit is actually a blue-green algae known as Gloeocapsa Magma that is spread by airborne spores.

Will Wet and Forget clean shingles?

You don’t need to use harsh chemicals that will damage your downspouts, or a power washer that is a hassle and may damage shingles, to get rid of these pesky growths, though. Wet & Forget Outdoor is the premium option when it comes to zapping these stains and keeping your roof’s surface healthy and attractive.

Do roof shingles fade over time?

Asphalt shingles do indeed fade, but the rate at which they lose color can vary, especially when it comes to shade. … If you want your shingle color to last, try to pick out lighter colors. Shingles often fade in uniform degrees, but there’s no guarantee.

How much does Roof Cleaning Cost?

Roof Cleaning Costs

Cleaning a roof costs $295 and $595, or $434 on average. Expect to pay between $0.20 and $0.60 per square foot. Regular roof cleaning makes it last longer and improves your curb appeal. This is a dangerous project that can damage your home, so it’s best to hire a pro.

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Do zinc strips prevent moss?

Zinc strips can be somewhat effective at controlling moss growth. Zinc strips work by slowly releasing zinc particles when rain water hits the strips. That rain water then runs off and inhibits moss and other organic growth on your roof.