GAF vs Owens Corning Shingles: Middle Tennessee Roofer Compares Algae Protection
Key Takeaways Owens Corning upgraded their algae protection warranty to 25 years in January 2023 - matching GAF's 25-year coverage on standard Timberline HDZ shingles GAF maintains simpler warranty terms with unconditional 25-year algae protection on standard Timberline HDZ shingles Middle Tennessee's humid climate creates perfect conditions for Gloeocapsa magma algae that feeds on limestone filler in shingles Both manufacturers use copper-based technology to release algae-fighting elements over time Some roofing comparisons still reference outdated 10-year Owens Corning warranties despite recent improvements Choosing the right shingle protection against unsightly black roof streaks requires understanding the latest warranty changes from major manufacturers. Middle Tennessee homeowners face unique challenges with algae growth due to the region's humidity and shade patterns that create ideal conditions for roof discoloration. GAF Offers Straightforward 25-Year Protectio...