Why is My Roof Turning Black?

One of the reasons you might need to call roof repair in Philadelphia is because your roof is turning black. Black streaks on the roof are caused by algae known as Gloeocapsa magma. As this blue-green algae accumulates in one spot over time, it cultivates into the dark outer coating that you can see. While this algae’s spores are airborne and unavoidable, certain factors can inhibit or accelerate their growth.

Roof algae can cause more than just appearance problems on the north side of your home. Here are four reasons why the algae are turning your roof black and how you can prevent it from happening.

The Roof’s Shingles Benefit the Algae’s Growth

It is possible that the roofing shingles contributed to the black streaks on the roof. Some asphalt shingle manufacturers include other materials to save money, such as fiberglass or limestone. However, this can be detrimental to the quality of the shingles, as algae are able to eat the crushed limestone and continue to grow while damaging the shingles’ composition in the process. Try to ensure that the shingles in your asphalt roofing do not contain high amounts of limestone or other ingredients that can help algae grow.

Your Home Is Located In a High Moisture Area

High levels of moisture are one of the reasons for roofs turning black, as algae are able to grow more effectively if they have access to moisture. As a result, homes that are located in environments with higher moisture levels are more prone to experiencing black streaks on their roof.

Places that are known for their humidity, warmth and are on the coast are the most at risk, such as the American states in the Northwest and Southeast. Other parts of the country are not immune to algae growth on the roofs; their chances are just not as high. Homeowners who live in the zones where algae are more likely to grow must pay attention to their roofs more carefully and maintain them accordingly.

You Aren’t Cleaning Your Roof Enough

As algae spores are airborne and unavoidable, homeowners must take adequate steps to prevent them from growing. Cleaning your roof can help stop algae from building up and prevent the roof from turning black, meaning those who neglect proper maintenance of their roof invite algae to grow there and create black streaks on the roof. Numerous cleaning solutions can be used, such as oxygen bleach or chlorine bleach. Pressure washing your roof with a high-pressure washer can be useful for cleaning or hiring a professional with roof cleaning experience.

The Roof Is Not as Protected as It Could Be

There are several ways that homeowners can protect their home’s roof from turning black. One form of protection is applying copper or zinc strips underneath your shingles. These metal strips can be toxic to algae and inhibit their growth, so flowing rainwater will collect some of the molecules of the slips and kill any algae it comes into contact with. Some shingles come infused with metals such as copper, so consider installing them if you ever need to replace your existing shingles.

If you’re searching for siding in Philadelphia or other home improvement services, contact Union Roofing today to address mold or mildew and other problems!


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