Those dark streaks running down your roof aren’t just dirt — they’re living organisms that slowly break down roofing materials if left untreated.
What Causes Black Streaks on Roofs?
The black stains commonly seen on Michigan roofs are caused by Gloeocapsa magma, a type of algae that feeds on limestone fillers in asphalt shingles.
Over time, this algae:
- Traps moisture
- Accelerates shingle deterioration
- Shortens roof lifespan
Why Roofs Should Never Be Pressure Washed
Pressure washing a roof can:
- Remove protective granules
- Damage shingles
- Void manufacturer warranties
That’s why professional roof washing relies exclusively on soft washing.
How Soft Washing Safely Cleans Roofs
Soft washing removes algae without damaging shingles by:
- Applying low pressure
- Using roof-safe cleaning solutions
- Allowing dwell time to kill organic growth
How Roof Washing Helps Long-Term
- Extends roof lifespan
- Improves curb appeal
- Prevents premature replacement
Professional Roof Washing Matters
Improper roof cleaning is one of the fastest ways to cause expensive damage. Hiring a trained professional ensures safe, effective results.