Does Your Shingled Roof Have Black Streaks? Here's What Florida Homeowners Should Know

JoeTriangleRoofing
Jul 1
2 min read

Updated: 4 days ago

If you've driven through Edgewater, Port Orange, Ponce Inlet, or any coastal Florida neighborhood, you've probably seen it: dark streaks or stains running down asphalt shingle roofs. These black marks are more than just cosmetic—they can signal deeper issues that affect your roof's lifespan, your home’s curb appeal, and even your insurance.

Let’s break down what causes roof streaks, how to deal with them, and what roofing options prevent this problem in the future.

🌧️ What Causes Black Roof Streaks in Florida?

Black roof streaks are typically caused by Gloeocapsa magma, a type of airborne algae that thrives in Florida’s warm, humid climate. It settles on shingles, especially in shady or damp areas, and creates unsightly black streaks as it dies and decays.

Key contributors to algae growth include:

Overhanging trees or debris on the roof
North-facing roof slopes that stay damp longer
High humidity and coastal moisture

Even sunny roofs can develop streaks over time—especially if algae aren't burned off quickly by sunlight.

🧱 Can Algae Damage Asphalt Shingles?

Yes. Over time, algae growth can degrade the protective granules on your shingles. This weakens your roof's ability to reflect sunlight and resist water, leading to:

Reduced energy efficiency
Premature shingle deterioration
Higher risk of leaks and heat buildup

In Florida, where energy efficiency is critical, roof damage from untreated algae can raise your cooling costs and lower your property value.

🧼 Should You Clean the Streaks Off?

Not without a professional inspection first. Many homeowners attempt to clean roof streaks using bleach, pressure washing, or DIY methods—but this can void your shingle warranty or cause further damage by stripping protective granules.

We recommend:

Scheduling a free roof inspection first
Avoiding harsh chemicals or pressure washing
Considering algae-resistant shingles for long-term prevention

Professional roofers can identify if the stains are harmless, or if you need repairs or a roof replacement.

🛠️ Best Roofing Options to Prevent Streaks

If your roof is older or showing signs of wear, now may be the time to replace it with algae-resistant roofing materials. Many modern shingles—like StreakFighter® shingles from CertainTeed—contain copper granules that prevent algae growth and come with a warranty.

At Triangle Roofing Inc., we help homeowners choose the best shingle or metal roofing options for Florida’s unique climate. We'll walk you through colors, materials, energy savings, and long-term durability.

New shingle roof in Port Orange FL — New Asphalt Shingles

🏠 Local Roofing Experts You Can Trust

Located in Ormond Beach, Triangle Roofing proudly serves Flagler Beach, Port Orange, Daytona Beach, Ponce Inlet, and surrounding areas. Our licensed team provides: