What Are the Black Streaks on My Roof?

Identifying Roof Streaks

Those black lines running down your shingles are usually colonies of algae.

They tend to grow on shaded or moisture-prone areas of the roof first.

Why Roof Streaks Are More Than Cosmetic

Over time, algae can contribute to uneven heating and cooling of your roof surface.

It can also hold moisture that encourages further growth and staining.

Safe Ways to Remove Roof Streaks

The safest method is typically soft washing with a roof-appropriate cleaning solution.

High-pressure methods are not recommended on most shingle roofs.

Preventing Future Streaks

Improving roof ventilation and trimming back overhanging branches can help reduce future growth.

Regular inspections and cleaning can keep streaks under control.

Need Professional Help?

If you would rather have a trusted team handle the cleaning, A&T Soft Washing provides soft washing and pressure washing across Michigan, Texas, and Northern Indiana.

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