Mold and Algae on Roofing: The Reasons Why It Happens and What to Do

Your roofing system may seem like an unlikely place for plants to grow, but nature seems to find a way. Mold and algae often find a welcome home on many roofs, especially if your roof uses traditional shingles. Asphalt shingle roofs have rough surfaces that catch the airborne spores of algae and mold; add in a little moisture and they can start growing. Homeowners will only notice them from the ground when the algae or mold has extended to cover a large part of the roof.

Though they may look similar, mold and algae are very different from each other. Algae is actually small plants, while mold is fungi. Since algae has a different color, the main distinguishing factor is how they look. Typically, algae found on a roof is blue-green. Mold is often black because of the spores it releases.

For many, having algae or mold on their roof is a cosmetic issue. After all, a black or blue-green stain on your roof makes your house look bad and it affects the resale value of the home. However, there are more practical reasons why homeowners should be concerned about mold and algae.

Mold and algae can weaken the structure of the roof as they feed off the organic materials found contained therein. This is especially true with mold, since it can quickly spread to the inside of your home. Mold can become a health hazard since the spores are a notorious allergen.

If you notice mold or algae growth on your roof, do not hesitate to contact a trusted roofing service, like Easton Roofing Company. These professionals can help remove mold and algae safely, as well as conduct any necessary repairs to your roof.

Source/s:
How to Remove and Prevent Black Algae Stains on Asphalt Shingle Roofs, Today’s Homeowner
Getting Algae and Moss Off the Roof, This Old House
Removing Moss and Algae From Roofs, Ask The Builder

Joe Speicher