Do You Have Black Streaks on Your Roof?

Black streaks on a roof can be unsightly and potentially damaging to the integrity of the roof. These streaks are often caused by a type of algae known as Gloeocapsa Magma. While not harmful to humans, this algae can eat away at the shingles on a roof and shorten its lifespan.

If you have black streaks on your roof, it’s important to address the issue as soon as possible. Ignoring the problem can lead to more extensive and costly damages down the line.

To remove black streaks from your roof, you can try using a 50/50 mixture of water and bleach applied with a soft-bristled brush. Be sure to take safety precautions, such as wearing protective clothing and eyewear, when working on your roof. It may also be a good idea to hire a professional to handle the job if you are not comfortable working on your roof.

Preventing black streaks from forming on your roof in the first place is the best course of action. This can be achieved by trimming trees and shrubs near the roof to allow for proper airflow and sunlight, which can prevent the growth of algae.

In conclusion, black streaks on a roof can be unsightly and potentially damaging if left untreated. It’s important to address the issue as soon as possible and consider preventative measures to avoid future occurrences.

This post was written by a roofing specialist at, one of the best roofing companies in the Tampa Bay area! We are a family-owned and operated roofing business, striving to be the best in our industry. Our family has been in the Tampa Bay area for over 60 years, and our objective has always been to provide roofing services at a fast, reliable, and competitive rate. All Star Roofing has a tradition of quality workmanship, servicing residential and commercial properties.

Jack Herold