Roof algae forms easily but can be easily controlled.


Have you noticed dark patches or discoloration on your roof? Algae thrives in moist climates making humid cities. As algae spreads from home to home, it leaves noticeable growth on roofing systems.

What Causes Algae on Roof Shingles?

Algae is a type of aquatic plant found in dark, damp areas such as lakes and rivers. All it needs is one spore to grow into an extensive culture. As wind carries algae spores, it can often land on your roof or gutter system. Once algae bacteria lands on your home, it will eat away at whatever it finds to continue to grow. This means that gutter build-up, asphalt shingles, and limestone filler help fuel its growth.

While plants may seem harmless, algae can have disastrous effects on your home, such as:

  • Discoloration and Changes in Roof Appearance
  • Wood Rot and Structural Damage
  • Roof Leaks
  • Mold Growth
  • Underlayment Damage
  • Decrease in Home Value

How to Prevent Algae on Roof

One of the best ways to take care of algae growth is to prevent it from making your house its home. The most impactful method is by limiting the moisture on your home’s exterior. You can do this by:

  • Regularly Trimming Trees, Overhang, and Plantlife
  • Apply Moisture-Resistant Treatments to Your Roof
  • Hire Professionals to Maintain Your Roofing and Gutter System
  • Invest in an Algae-Resistant Roof Replacement Such

How to Get Rid of Algae on Roof Shingles

Once signs of algae appear, you need a professional roofing contractor to properly care for the damage. During your roof inspection, they’ll make sure to assess signs of damage and make the necessary recommendations. If damage is minor, they’ll be able to make roof repairs, use preventative treatments, and schedule maintenance appointments. However, if the algae growth is too extensive, they may need to install a comprehensive roof replacement. A GAF roofing system is a popular choice for homeowners looking to reduce their risk of algae growth.

Schedule Your Free Inspection With a Professional Roofing Company

If you’re worried about algae on your roof, you can schedule a free inspection at Feazel. For over 20 years, we’ve been the top choice for a certified roofing company. Our experienced roofers will diagnose your roof and set you up with comprehensive repairs or a new algae-resistant roof replacement. Call today or fill out our online form to begin your algae inspection!