Roof Cleaning: The Safe Way to Remove Black Streaks or Black Growth

Brown asphalt roof half cleaned by soft washing, black streaks on one side and clean on the other

Gross, what’s up with the ugly black streaks or black growth on your roof? Many roofs also grow green lichen, mold and moss. The good news: Power Play offers safe roof cleaning across Lebanon, Lancaster, Dauphin and Berks counties.

What That Black Streaking or Growth Really Is

Those dark streaks are a living algae (Gloeocapsa magma) that feeds on the limestone filler in asphalt shingles. It spreads year after year, holds moisture against your roof, and makes even a newer home look tired. Moss and lichen dig in further and can lift shingle edges over time. The longer it grows, the harder it is to remove.

Garage roof covered in black streaks from Gloeocapsa magma algae before roof cleaning
Before
Same garage roof after a Power Play soft wash roof cleaning
After

Technique Is Everything

Pressure washing is NOT the right way to clean a roof. High pressure strips the protective granules off your shingles and can shorten the life of your roof.

We’ve been cleaning roofs since 2002, and we use a soft wash. We apply cleaning solutions approved by the Asphalt Roofing Manufacturers Association (ARMA), following the roof manufacturers’ approved process. The solution kills the growth at the root instead of just knocking it back. Then we rinse with a low-pressure hose. No high pressure ever touches your shingles, and a soft wash usually stays clean much longer than pressure washing.

What We Go Over When Quoting Your Roof

  1. How far along the growth on your roof is
  2. How we’ll safely access your roof
  3. Which cleaner fits your situation
  4. Controlling runoff from your roof
  5. Protecting your plants and landscaping
  6. The results you can expect
  7. How to keep it clean moving forward

A thorough look up front means your property looks great and stays that way for years.

Is Your Roof Worn, Not Just Dirty?

If your shingles are dry, faded or losing granules but not leaking, cleaning alone may not be enough. Ask us about our soy roof rejuvenation treatment, which can add years to an aging asphalt roof for a fraction of the cost of replacement.

See more roof cleaning before and after photos, or call Nate at 717-314-2360 for a free quote.

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