Building A Better Bathroom: Tips For Bathroom Construction

Is Black Algae The New Black Death? Algae 101 And Natural Removal Tips For Your Roof

Characterized by dark, oozing boils, fever, vomiting, and intense pain, The Black Death wreaked havoc on all of Europe in the middle part of the 1300s. While surprising to hear, this horrible plague killed 20 million people in Europe alone. Fortunately, the disease is no longer a problem. However, if you are a homeowner living in a moist area, you may be dealing with your own type of plaque. Black algae, or Gloecapsa Magma, is a problem you may be facing on your home. You may not be familiar with this unappealing issue that plagues roofs all across the globe. To remove this algae from your roof, it is important to understand what causes this "plague."

Black Algae 101

To be technical, this algae is not really black in color, but is actually a dark, mossy green. On your asphalt shingles, green algae appears as an ever darker discoloration.

Gloeocapsa Magma is common in moist, humid climates. If you live in the southern part of the country, you may have this dark staining on your roof. Of course, it can easily affect any roof, no matter the weather conditions.

Spread by wind and animals, black algae develops slow, accumulating as a small spot and growing out into streaks across your roof. As it grows, the algae holds in excessive moisture, causing your roofing shingles to loosen, break, or warp. This premature aging is not only dangerous for your shelter, but also an expensive problem to repair. Using cleaning solutions and a pressure washer to remove the algae will stop further spreading and possible damage to your roof.

Since algae is a type of fungus, your first inclination may be to use bleach. Although extremely effective for cleaning and killing mold, chlorinated bleach may cause irritation to your skin and eyes. In addition, many users suffer with respiratory problems while working with bleach. Fortunately, there are a few natural options for killing this black roofing plague.


In the 14th century, people fled their native countries in an attempt to escape the Black Plague. Others ventured out in hopes of treatment, which included painful bloodletting and lancing boils. Many people believed the plague was a punishment from God and accepted their fate.

When you first see algae on your roof, you do not need to flee your home or accept the unappealing fate. Of course, using harsh chemical treatments is also not necessary for killing this roofing plague.

Hydrogen Peroxide

  1. Add 3 gallons of water to an outdoor pump sprayer.
  2. Pour in 3 cups of hydrogen peroxide.
  3. Shake the sprayer container to mix.
  4. Spray a thick amount of the solution on your roof.
  5. Let the hydrogen peroxide solution sit for 30 minutes.
  6. Use a pressure washer to rinse off the excess.

The hydrogen peroxide not only kills the algae, but it also removes dirt and debris from your roof.


Vinegar is one of the most important ingredients to have in your natural cleaning arsenal. Fortunately, it is also a staple in most households. Containing acidic properties, vinegar effectively kills mold, mildew, bacteria, and the dreaded black algae plaguing your roof.

Combine the following in an outdoor pump sprayer:

  • 3 gallons of water
  • 2 gallons of white vinegar

Shake the sprayer to mix the ingredients. Then, pump the sprayer handle to create pressure. Douse a thorough amount of the vinegar solution onto one section of roof. Allow it to rest for a few minutes before rinsing off with your garden hose. Work on one section at a time to ensure you clean every one of your asphalt shingles.

Sadly, the Black Death worried millions of people as it swept through the world. While black algae will not harm you or your family, it can affect your roof in a devastating manner. By using this guide or finding experts such as, you can escape the black plague on your roof. 

About Me

Building A Better Bathroom: Tips For Bathroom Construction

The one challenge I always had with my house was the fact that there was no bathroom on the first floor. Once I reached a point where I had equity in the house, I decided it was time to do some renovations. After working with a local construction contractor to map out the plans for converting the mud room into a first-floor bathroom, I decided to chronicle the entire process. I created this site to do just that in the hopes that reading about my experiences and what I learned may help others decide to tackle that renovation project they've always wanted to do as well.

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