How to Mix Zinc Sulfate Powder to Kill Moss

Removing unsightly moss from your roof is an important part of home maintenance. Moss is more than just ugly — it can dam and divert water runoff, causing water to leak into your home. However, while mixing and spraying a zinc sulfate solution, you must be careful to protect the surrounding vegetation and watershed. Zinc sulfate is toxic to fish and other invertebrates.

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Wood shingles are a favorite place for moss to grow.

Step 1

Put on safety gear, including work gloves, a breathing mask and safety glasses.

Step 2

Pour 3 gallons of warm water in a plastic 5-gallon bucket. Do not use metal — the zinc may react with metal items.

Step 3

Add 1-1/2 lbs. of zinc sulfate powder slowly to the water to avoid dispersing the powder in the air. Stir it with a disposable painter's stick to mix it thoroughly.

Step 4

Pour the zinc sulfate solution into a garden sprayer. Attach a garden hose to the sprayer and apply it to the roof.


Ruth de Jauregui

Ruth de Jauregui

With degrees in fine and commercial art and Spanish, Ruth de Jauregui is an old-school graphic artist, book designer and published author. De Jauregui authored 50 Fabulous Tomatoes for Your Garden, available as an ebook. She enthusiastically pursues creative and community interests, including gardening, home improvement and social issues.