Do You Have Black Streaks On Roof Shingles? Let Us Help You Remove Them

If you think those darker, black streaks on your roof are dirt, mildew, mold, or soot, you will be surprised to learn it is actually bluish-green algae called gloeocapsa magma. Algae appear darker to homeowners because it forms a pigment coating to shield it from the sun’s UV rays. If you notice black streaks on shingle roofs, this is what you need to know to get rid of it quickly.

Why Algae Form On Shingles

Algae is an airborne spore that can be transferred by the wind, by the homeowner, or rodents that have access to your roof. Algae thrive on any rooftop dwelling as it uses limestone filling as a primary food source. You are also susceptible if your neighbor has roof shingle streaks, so it is essential to learn the signs and symptoms even if you have not yet experienced algae first-hand.

Is Algae More Likely In Certain Weather Or Seasons?

Algae moderately grow in the northeast, more excessive in the south, and most severe in the mid-eastern states. The hotter and more humid the climate and weather, the more likely you will see algae roof streaks. You may also see specific growth patterns that favor the south side of your roof since the sun rises and moves during the day. It shades the northern side of your home.

As it does not receive direct sunlight, it is the perfect condition for moisture to accumulate and help the algae to grow  A gutter clog, blocked drain, or overhanging limbs are also problematic as they contribute to the moisture on the roof. Homeowners must inspect areas for wetness or indirect sunlight UV granules on shingles as they dry out and cause them to come off eventually.

Is Algae Dangerous?

Roof shingle streaks are not dangerous to the occupants in the home, but it will cause unsafe rooftop conditions when the algae come into contact with airborne fungus as it forms a lichen. As it feeds off the limestone filler and algae, they grow roots which will be more difficult to remove.

Can I Remove Black Streaks Myself?

You can remove algae by cleaning the roof with a homemade solution or OTC commercial brand. The problem with a DIY cleansing is that you may inadvertently void a warranty or a homeowner’s insurance policy if you cause damage with harsh chemicals like bleach or lye.

You should also avoid the use of a power washer as the high pressure, even on its lowest setting, will damage shingles by removing its protective layering or forcing them off completely. You must also be aware of using water as it creates moisture pockets that will cause algae to regrow.

If you don’t have protective gear, want to avoid higher elements, or want to protect your shingles from damage, you should hire a professional to remove the black algae stains. All our North Shore Roofing experts are fully trained in eco-friendly, non-corrosive algae treatment technique.

We also have products like zinc, copper, or galvanized sheet metal that kills algae. If you already have broken shingles, we will also offer roof or shingle replacement if the damage is too extensive. For an appointment, call at (978) 977-3816 or visit us on our Facebook page here