06/17/2026
Roof Replacement or Roof Cleaning?? Which cost more??
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Gloeocapsa magma is a type of cyanobacteria 🤢 (blue-green algae) that appears as black streaks on roofs, feeding on the limestone filler in asphalt shingles. It thrives in warm, humid conditions, and its dark, protective outer layer causes the streaks, which 💧 trap moisture, accelerate shingle deterioration, and can lead to premature roof failure. While it can be removed with professional soft washing or a bleach/water solution, high-pressure washing should be avoided as it damages shingles.
What it is:
A photosynthesizing bacteria, often called "blue-green algae".
It forms a dark, protective sheath to shield itself from UV rays, which is the visible black streak.
It spreads via wind and water, often starting on the shadier, damper sides of a roof.
Why it's a problem:
Damages shingles: It eats the limestone filler, weakening the roof and causing granule loss.
💧Traps moisture and heat: This accelerates shingle aging and can increase cooling costs.
Reduces curb appeal and value: The stains make a home look older and can lower resale value. 💲
🤧Can cause health issues: In some cases, it may trigger allergies or respiratory problems, and pets are also susceptible.
How to treat it:
💦Soft washing: A professional method using algaecides and biodegradable cleansers with low pressure is recommended.
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