How to Prevent Moss and Algae Growth on Your Roof
April 2, 2025

Moss and algae might seem like minor nuisances, but they can cause serious damage to your roof over time. Moss absorbs moisture, which can lead to wood rot and shingle deterioration, while algae create unsightly black streaks that can reduce your home’s curb appeal. Both can also contribute to premature roof aging, leading to costly roof repairs or replacements.

Keep Your Roof Clean and Dry

The best way to prevent moss and algae growth is to create an environment where they can’t thrive. Here’s what you can do:


  • Trim overhanging tree branches to allow more sunlight to reach your roof and reduce moisture buildup.
  • Clear leaves, twigs, and other debris from your roof and gutters to prevent trapped moisture.
  • Inspect your roof regularly for signs of moss or algae so you can address small issues before they become major problems.

Improve Roof Drainage

Excess moisture is a key factor in moss and algae growth. Keeping water flowing properly off your roof can help minimize the risk.


  • Clean your gutters and downspouts regularly to prevent water from pooling on your roof.
  • Check for clogs and repair misaligned gutters that may be trapping moisture along the roofline.
  • Consider installing a roof ridge vent to improve ventilation and reduce humidity levels in your attic.

Use Preventative Treatments

If your roof has a history of moss and algae growth, a preventative treatment can help keep it under control. There are a few ways to do this:


  • Install zinc or copper strips along the roof’s peak. When it rains, metal particles wash down and inhibit moss and algae growth.
  • Apply a specialized roof treatment designed to prevent moss and algae. These solutions are available from professional roofing companies and can help protect your shingles.
  • Choose algae-resistant shingles if you’re replacing your roof. These shingles contain granules that prevent algae growth over time.

Schedule Professional Roof Maintenance

Regular roof maintenance is key to preventing moss and algae from taking over. A professional roofing company can safely remove any existing growth and apply protective treatments to extend the life of your roof.


If you’re dealing with moss and algae on your roof in Missoula, MT, we can help. At A&B Roofing, we provide expert roof maintenance and treatments to keep your home protected. Contact us today to schedule a roof inspection and keep your roof in top shape year-round.

Author Details

Denise Haycook

Co-Owner


Denise Haycook, with her extensive experience of more than 10 years, is the proud co-owner of A&B Roofing.

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