What Are Those Black Streaks On My Asphalt Roof?!

July 12, 2012

What are those black streaks on my asphalt roof?!

Will a metal roof get them?

The black streaks on your asphalt roof are algae called gloeocapsa magma. Fancy name for a not so fancy problem.

This type of algae feeds on the limestone that is crushed to make the shingles. When it rains the algae starts to streak down the roof causing those unsightly black streaks. There are a few problems when this happens to your asphalt roof.

  1.  The shingles that are affected can be caused to prematurely fail, resulting in not being able to properly deflect heat
  2. Even when cleaned properly with algae cleaner (which needs to be done annually) the stains can keep coming back
  3. It can also cause rotting, premature aging and/or granule loss

So how can this problem be fixed? The answer is simple, you go with an alternative roofing solution.

What kind of roofing solution you ask?

A metal roof.

A metal roof will be the last roof your home will ever need.  With a metal roof you won’t get the nasty algae that you can with traditional asphalt and shingle roofs. A metal roof will resist mold, mildew and other types of fungus. Metal roofs are very maintenance free, they will not rust, crack or rot.