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Safe products to use on roof to kill and prevent future algae and moss #819485

Asked January 30, 2023, 7:24 PM EST

Dear Expert, Would Vinegar, hydrogen peroxide, SafeGro No Moss (Cottonseed oil, Clove Oil Garlic Oil, orbital, Oleic Acid, Lauric Acid and Stearic Acid formua), Sodium Hydroxide, Oregano or Oregano oil, or Pure Lemon Juice & Salt be okay to use on our roof? There is also a product called Moss Melt that is a Citris based product. I have been told not to use Zinc Sulfate as it can be harmful to aquatic life. What do you recommend? I have found a professional who is willing to use whatever product I want. I want them to be safe and for it also to be safe for the roof and of course for aquatic life and our plants. Thank you for your assistance. Kind regards, Mindy

Multnomah County Oregon

Expert Response

According to OSU Extension Service: 

Potassium salts of fatty acids [are] soap-based biodegradable products that kill moss by penetrating the cell walls and changing the membranes so that the cells leak and the moss dies. The product is noncorrosive and pose minimal risk to humans and animals."

This is a low-risk and effective option for moss control on roofs. You and/or your roof maintenance person can find details in teh link. DIY options mentioned are not likely to be effective and may pose their own risks. 
I hope these resources help you decide what steps to take next. If you have any questions, don't hesitate to reach out. Thanks for contacting OSU Extension Service. Replied January 31, 2023, 3:12 PM EST

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