Griffith Roofing | Roofing Services in Union City, TN 38261

Those black streaks are typically a type of algae called Gloeocapsa magma, which thrives in our humid Tennessee climate. It feeds on the limestone filler in asphalt shingles and can hold moisture against the roof surface, potentially shortening shingle life. While primarily cosmetic, it's a sign your roof is retaining moisture.

Flashing corrosion is common due to our area's humidity and temperature swings, which accelerate wear on metal components like step flashing around chimneys or valley flashing. We fix it by carefully removing the damaged sections, replacing them with high-quality, corrosion-resistant metals (like aluminum or galvanized steel), and sealing them properly to restore a watertight barrier and prevent leaks into your home.

It can if done incorrectly with high pressure or harsh chemicals. At Griffith Roofing, we use a specialized, low-pressure soft wash technique with EPA-approved, biodegradable cleaners that safely kill the algae and rinse it away without blasting off the protective granules on your shingles. This preserves your roof's integrity while restoring its appearance.