Due to the humid, hot weather here in North Port and Sarasota, a lot of roofs have algae growing on them. Sometimes it’s evident. Sometimes it’s not. How do you know if you have algae on your roof and how do you remove it?
The algae growth on roofs are microorganisms which thrive in moist conditions. They spread by releasing spores into the air. Those spores usually require a moist surface to open. If the moist surface they land on is your roof, that’s where they bloom.
Do You Have Algae on Your Roof?
The most common sign you have algae growth is black streaks on your shingles. The streaks may be slimy and dirty in appearance. The algae streaks can come down the side of the house and stick to the siding and trim.
You may not see the streaks near metal flashing because the zinc coating on galvanized steel repels algae. Copper flashing also repels these growths. Metal particles can flow down the roof with rainwater, killing off any algae growth in its path.
Blue-green algae, the most common form that grows on roofs, is generally not harmful to the roofing materials. The biggest problem is the streaks the algae cause.
How Do You Deal with the Algae?
Chlorine bleach will kill the mold on shingle roofs. A solution of bleach and water gets sprayed on the roof’s surface and left there for a short time. After that, it’s critical to spray the entire surface down with clean water to prevent the bleach from lingering. If left, it could damage roofing nails and other materials.
It’s best to have professionals do the work. They know the proper solution to use and have the equipment to do the job properly.
How Do You Prevent Algae Growth?
To prevent algae from coming back, you need to get as much sun to your roof as possible. Trim back trees which shade the roof. Keep debris from accumulating. Clear gutters so moisture has a place to go.
Also, when it’s time to replace your current roof, consider algae-proof shingles. They contain tiny flecks of copper which help repel algae growth. Another option is a galvanized steel or copper roof.
If you suspect that you have algae growth on your roof, call Mark Kaufman Roofing today.