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Distinctions Between Algae and Mold

May 16, 2024 | Uncategorized

Algae and mold can both harm your property, but they are quite different. Mold is a fungus that feeds on nutrients to survive, while algae is more plant-like and consumes the limestone filler in roof tiles and organic matter on siding. Both are bad news for your home’s exterior. Keep reading to learn about the differences between algae and mold, and how to remove them.

Algae Overview

The scientific name for the algae on your roof is Gloeocapsa magma. Algae is airborne and spreads from one roof to another. It feeds on the limestone in your tiles, leaving black stains. If left untreated, algae can break down the granules in your shingles, leading to roof damage and the need for replacement.

Algae also grows on your home’s siding, especially on the north side where there’s less sunlight. If one side of your house looks dirtier, algae is likely the cause.

Mold Overview

Mold is a fungus and not a plant, so it produces spores. These spores are very small, much smaller than a strand of human hair.

Mold thrives in moist, dark places like behind siding and roof shingles. Mold spores multiply quickly. People with mold allergies or asthma might have severe reactions, such as coughing, worsening asthma symptoms, eye or skin irritation, throat irritation, and a stuffy nose.

How to Get Rid of Algae

Hiring a professional like Prowash to treat your roof and siding is a smart choice. Professionals are insured, protecting you from damage to your property. Also, there might be more organisms on your roof and siding than just algae. For example, algae can partner with certain fungi to form lichens. A professional will check and treat your home for algae, mold, lichens, and early moss growth.

How to Remove Mold

The best way to remove mold is with professional power washing. A skilled team will use a biodegradable cleaner to eliminate mold and prevent it from returning.

Mold can grow under siding panels, causing early replacement if ignored. It can also get into the underlying plywood, becoming a serious health risk. Always contact a professional if you suspect mold; never try to remove it yourself.

Algae and Mold Removal and Prevention

At Prowash, we recommend cleaning your house yearly to prevent algae, mold, and mildew growth. Our certified professionals use specialized detergents to keep your home looking great and protected against these issues.

Prowash Services

  • House Washing
  • Exterior Window Cleaning
  • Concrete Cleaning
  • No Pressure Roof Cleaning
  • Gutter Clean Outs
  • Multi-Unit Cleaning (Apartments, townhomes, etc.)
  • Commercial Building Washing


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