Have you been doing a spot check of your asphalt shingle roof and noticed some dark streaks all over it? It could be a combination of many things — accumulated dirt, damaged shingles, or mold. You may be wondering why your roof looks dark and how to prevent it. Let’s look into this a bit more, and hopefully you’ll know how to fix it when this article is done.
More often than not, the culprit is actually a blue-green algae known as Gloeocapsa Magma. The spores of this algae are airborne and can be carried over to your roof by heavy and strong winds. The crushed limestone filler used in your asphalt roof will serve as their main food source. The hot and humid summer experienced in the southeastern part of the US will also contribute to the algae’s growth.
Although the algae won’t harm your roof in any way, its presence could be a major eyesore to an otherwise cozy home. This algae begins as small spots on your roof, but if left unattended, the spots become long streaks of monstrosity.
Removing the Dark Algae Streaks on Your Roof
We’ve talked about why your roof looks dark, and how to prevent it is next up. To prevent this algae from marring your home, you can ask your roofing contractor to choose an algae-resistant roof if you are in the process of a roof replacement.
However, if your existing roof has already been affected by this algae, there are lots of chemical cleaning agents that can be used.
Take note that there will be risks involved in cleaning your own roof. Going the DIY route could void your roof warranty or homeowner’s insurance policy. In addition, you may not have the right roof cleaning materials. You also might not have the spare time to clean. And, even if you do, you could end up hurting yourself in the process.