The Best Methods for Removing Moss from a Roof

The Importance of Removing Moss and Mold from a Roof

A clean and well-maintained roof is essential for the longevity and structural integrity of any building. Moss and mold growth on roofs not only detract from the aesthetic appeal but can also cause damage over time. Moss can retain moisture, leading to water damage and rotting of the underlying materials.

Mold, on the other hand, can deteriorate the surface of asphalt shingles, compromising their effectiveness in protecting the roof from the elements.

Removing Moss from a Roof

When it comes to removing moss from a roof, it’s important to do so carefully to avoid causing any further damage. Here are some effective methods:

  1. Manual Removal: Start by using a sturdy ladder to access the roof. Gently scrape off the moss using a soft-bristle brush or a plastic scraper. Take care not to damage the shingles or underlying materials. Once the moss is removed, collect it and dispose of it properly.
  2. Chemical Treatment: Another option is to use a moss-killing solution. These solutions are typically available in the form of sprays or powders. Follow the instructions provided by the manufacturer and apply the solution to the affected areas. Allow the solution to work for the recommended duration, and then gently brush off the dead moss.
  3. Zinc or Copper Strips: Installing strips of zinc or copper along the roof ridge can help prevent future moss growth. These metals release ions that inhibit moss and algae growth. Over time, rainwater washes these ions down the roof, discouraging moss from taking hold.

It’s important to note that pressure washing is not recommended for removing moss from roofs, as it can damage the shingles and underlying materials.

How to Clean Asphalt Shingles with Mold

If you notice mold growth on your asphalt shingles, it’s crucial to address the issue promptly to prevent further damage. Here’s how you can clean asphalt shingles with mold:

  1. Prepare the Area: Start by protecting the surrounding areas with plastic sheets or tarps to prevent any cleaning solution or debris from damaging plants or other surfaces.
  2. Mix a Cleaning Solution: In a bucket, combine equal parts water and bleach or a specialized roof cleaning solution. Be sure to wear protective gloves and goggles while handling bleach.
  3. Apply the Solution: Using a pump sprayer or a soft-bristle brush, apply the cleaning solution to the affected areas. Allow the solution to sit for about 15 minutes to loosen the mold.
  4. Gently Scrub: After the solution has had time to work, use a soft-bristle brush or a low-pressure power washer to gently scrub the mold off the shingles. Start from the top and work your way down, being careful not to damage the shingles.
  5. Rinse Thoroughly: Once the mold is removed, rinse the shingles thoroughly with clean water. Ensure that all traces of the cleaning solution and mold are completely washed away.

It’s important to follow safety guidelines and wear appropriate protective gear when working with cleaning solutions and on roofs. If the mold growth is extensive or you are uncomfortable with the process, it’s best to consult a professional roofing contractor for assistance.

Maintaining a Moss and Mold-Free Roof

Prevention is key when it comes to keeping your roof free from moss and mold. Here are some tips to maintain a moss and mold-free roof:

  • Trim back overhanging tree branches to allow more sunlight and airflow, which helps prevent moss and mold growth.
  • Keep gutters and downspouts clear of debris to ensure proper drainage and prevent water from accumulating on the roof.
  • Regularly inspect and clean the roof to catch any early signs of moss or mold growth.
  • Consider installing zinc or copper strips along the roof ridge to inhibit moss and algae growth.

By following these maintenance practices and promptly addressing any signs of moss or mold growth, you can ensure the longevity and functionality of your roof.


Removing moss from a roof and cleaning asphalt shingles with mold are essential tasks for maintaining the integrity and appearance of your roof. Whether you choose manual removal, chemical treatment, or preventive measures, it’s important to handle these tasks with care and follow safety guidelines. Regular maintenance and prompt action can help keep your roof moss and mold-free, ensuring its longevity and effectiveness in protecting your property.