What is with these black streaks appearing on roofs in Western New York?!
No, it’s not dirt. It’s not defective shingles. It’s actually blue-green algae that grows on the north side of your roof, where the sun hits less and where moisture hangs around. The algae feeds on part of the filler in your shingles, making your roof a great home for them.
Now the question is, what can we do about this? If I have these black streaks on my roof, is it a big problem? Do I need to replace my roof?
The answer is no, you don’t! If algae is your only problem, all you need to do is get a good cleaning. This comes at a fraction of the cost of a roof replacement. Plus, it’s a quick, natural process that’s completely safe for you and your home.