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To The Maxx

Guide for Algae, Moss & Mold Removal on Your Roof

July 22, 2020

streaks of roof algae on asphalt roof.

If you live in the South, Midwest, or another region of the country that has warm, humid summers, you may have noticed stains and streaks showing up on your asphalt shingles. These stains look a lot like mold—but in fact, much of this so-called mold is actually blue-green algae. This mossy plant doesn’t do any structural harm to your roof, although it does decrease the curb appeal of your home.

In less frequent cases, the streaks on the roof actually are mold, which can be very dangerous for your family and more difficult to get rid of. The most serious mold cases can cause asthma, headaches, and other health problems, so it’s crucial to understand the difference.

How to Spot Roof Mold & Algae

Mold comes in a variety of colors, from green, brown, or black. It usually starts to form in damp parts of the attic or basement and might spread to the roof and other outdoor areas of the home. In contrast, algae and moss are usually green or blue-green. They begin growing directly on the shingles and are a common issue in humid climates.

Steps to Clean Mold, Algae, & Moss from your Roof

Cleaning up roof moss and algae is a much simpler process than dealing with roof mold removal. Luckily, moss and algae are more common than mold, so this is the more likely the process you will need to follow:

  • Mix 1 part oxygen bleach cleaner with 1 part water. (Add ½ cup per gallon of trisodium phosphate for a stronger cleaning solution.)
  • Pour the bucket of solution onto the affected area of the roof and let it soak for an hour.
  • Rinse using a pressure washer or hose.

If you suspect that you have a mold problem, it’s important to call a mold remediation professional to come inspect your attic and roof. They’ll be able to tell you how much damage has been done and what to do moving forward. We don’t recommend trying to handle roof mold removal on your own.

Prevent Roof Mold & Algae

Roof mold and algae usually grow because of moisture and bacterial growth. Here are a few effective ways to prevent future growth once you have gotten rid of mold and algae:

  • Trim trees near the home: Overgrown trees often spread bacteria onto the roof and cause algae growth. Make sure to plant trees far enough away from the house and trim them back regularly so they aren’t hanging over the roof.
  • Get rid of standing water: Standing water is another factor that can contribute to mold and algae growth. Minimize standing water on the roof by fixing shingles, cleaning gutters, and performing small roof repairs as necessary.
  • Wash your roof regularly: Hire a professional roof cleaner at least once a year to ensure that any growing bacteria is eliminated. This will lessen the chance of having to deal with a major mold or algae problem in the future.

Contact Roof Maxx

You’ll save yourself a lot of money and headaches by following our guide on how to remove roof mold and algae. And if you’re in need of roof rejuvenation, contact us at Roof Maxx to learn how we can apply our sustainable, affordable treatment to add up to 15 years to the life of your roof.

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