Q:

How do you remove moss stains from an asphalt shingle roof?

A:

Quick Answer

To clean moss stains from an asphalt shingle roof, use a brush to scrape the moss off of the shingles, and then spray the roof with a mixture of half water and half bleach. Avoid using a pressure washer to apply the mixture as the high pressure can damage the shingles.

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Full Answer

To clean moss or algae from shingles:

  1. Brush the moss
  2. Use a brush to scrape the moss or algae off the asphalt shingles.

  3. Apply a bleach mixture
  4. Create a cleaning mixture of half water and half bleach and pour over the shingles.

  5. Install metal strips
  6. To prevent future moss or algae growth, install zinc or copper strips underneath the shingles at the top of the peak of the roof. The metal strips allow rainwater to wash some metal molecules over the shingles, which prevents future algae and moss growth.

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