The Real Reason Black Streaks on Your Roof Shouldn’t Be Ignored

If you’ve ever noticed dark streaks running down your shingles, you’re not alone. Many homeowners in Van Wert, Fort Wayne, Decatur, and beyond think these black streaks are just dirt or wear—but they’re actually a living organism that can harm your roof and your home.

What Are Those Black Streaks?

Those marks are caused by Gloeocapsa magma, a type of blue-green algae. It feeds on the limestone in asphalt shingles and thrives in humid conditions—especially in the Midwest during the warmer months.

Why You Shouldn’t Wait to Clean It

1. It Shortens Roof Life
Algae slowly breaks down roofing materials. Left untreated, it can lead to early shingle deterioration, reducing the life expectancy of your roof.

2. It Causes Higher Energy Bills
Darkened shingles absorb more heat. That can raise attic temps and force your AC to work harder in the summer, increasing your cooling costs.

3. It Lowers Curb Appeal
Whether you’re selling your home or just trying to keep it looking great, black streaks on the roof make a big visual impact—for all the wrong reasons.

4. It Spreads Quickly
Algae spores travel through the air and multiply fast. Once it takes hold, it often spreads to nearby roofs too—so early action is key.

How TLC Removes Roof Algae Safely

Our soft washing method gently removes algae and streaks without damaging shingles. It restores your roof’s clean look and protects your home investment.