What Are the Black Streaks on Your Roof? (And Why Soft Washing Is Recommended)
If you’ve noticed dark streaks running down your roof, you’re not alone. Many homeowners assume these stains are dirt or mold, but the most common cause is actually a type of airborne algae called Gloeocapsa magma.
This algae thrives in warm, humid climates like Central Florida, especially in communities such as Minneola, Clermont, and Groveland. It feeds on the limestone filler used in many asphalt shingles, which leads to those noticeable black streaks that make roofs look aged and neglected.
What Causes Roof Stains in Florida?
Gloeocapsa magma spreads through airborne spores and attaches itself to roofing materials. Once established, it begins feeding on shingle components while retaining moisture on the surface. Over time, this creates black streaking, uneven roof discoloration, and reduced curb appeal. Florida’s humidity and frequent rain make roof algae growth especially common, and without proper cleaning the stains continue spreading.
Why Pressure Washing Is Not Recommended for Roofs
Many homeowners think pressure washing is the fastest way to remove roof stains. However, high-pressure cleaning is designed for hard surfaces like concrete and brick—not roofing materials. Pressure washing can remove protective granules from shingles, shorten the lifespan of your roof, and even force water beneath shingles. Because of these risks, roof manufacturers and industry professionals recommend a safer alternative.
What Is Soft Washing?
Soft washing is the recommended method for professional roof cleaning. Instead of using high PSI, soft washing uses low-pressure water combined with professional cleaning solutions to safely eliminate algae, mold, and mildew at the source. Rather than simply blasting away stains, soft washing treats the organic growth so it doesn’t immediately return—protecting your roofing materials while delivering longer-lasting results.
Benefits of Roof Soft Washing
- Safe cleaning for roof shingles
- Removal of algae and organic growth
- Longer-lasting results
- Improved curb appeal
- Reduced risk of surface damage
Roof Cleaning in Central Florida
The humid Florida climate makes algae growth common on roofs in areas like Minneola, Clermont, and Groveland. Regular professional cleaning helps maintain appearance and extend roof life. At Clean Surface Solutions, we specialize in safe roof soft washing and exterior cleaning designed specifically for Florida homes.
If you’re seeing black streaks on your roof and want professional cleaning done the right way, call 352-255-8579 today.