Are Architectural Asphalt Shingles More Prone to Algae Growth in Humid Climates?

No, architectural asphalt shingles are not inherently more prone to algae growth; rather, they are specifically designed with features to combat it in humid environments like Northwest Louisiana.

While algae (specifically Gloeocapsa magma) thrives on moisture and is common in humid climates, architectural shingles offer several advantages to maintain a roof’s appearance:

  • Copper or Zinc Granules: Many architectural shingles are manufactured with copper-infused or zinc granules. These materials greatly reduce the chance of black streaks and staining by resisting algae growth.
  • Manufacturer Warranties: Leading brands such as GAF, CertainTeed, and Atlas provide limited warranties specifically against algae streaks for their architectural products.
  • Built-in Protection: Architectural shingles often outperform standard 3-tab options in this category because they include built-in algae protection as a standard performance feature.

In addition to using algae-resistant shingles, ensuring proper attic ventilation is recommended to help keep the roof deck dry and limit the moisture that feeds algae growth.


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