Why shingles have dark streaks?​

Dark Streaks

Why do my shingles have dark streaks?

As you pull into your driveway, do you happen to look up and notice the dark streaks covering the roof of your home? It’s important to know that this staining is caused by airborne algae, and it’s a significant issue here in the Sandusky, OH area. Algae spores are known to cause unsightly black stains, smears, blotches, and streaks on standard roof shingles, which are highly susceptible to such discoloration. This is particularly problematic since the roof makes up a large portion of a home’s exterior, and removing algae stains can be both challenging and costly. As a result, the aesthetic impact of the discoloration can be a nightmare and can ultimately reduce the value of your home. If you’re struggling with an aged and stained roof, consider investing in a replacement with Streakfight algae-resistant shingles, such as Certainteed’s Landmark Pro. These shingles are specially designed to resist algae growth, providing a more durable and attractive solution for your home’s exterior.


CertainTeed has developed shingles with StreakFighter algae resistant technology. These shingles are made with a blend of surface granules that includes numerous copper-containing granules. Copper possesses natural anti-algae properties, and the copper in the granules is gradually released over time to provide reliable, long-term protection from algae formation to help a roof maintain its true luster.

CertainTeed StreakFighter Fights Dark Streaks

Landmark PRO provides the reliable quality of Landmark, along with greater durability and eye-catching Max Def colors. Engineered with two laminated layers to replicate the dimensional appearance of true wood shake, Landmark PRO offers peace-of-mind on projects that call for a premier aesthetic at an affordable price. Backed by a 100+ year legacy of trusted performance, all Landmark PRO shingles include CertainTeed’s industry-leading, lifetime-limited warranty.

  • Certified as meeting the industry’s toughest third-party (UL) manufacturing quality standards
  • Class A fire-resistance rating
  • Fifteen year StreakFighter® algae-resistance warranty