How to Prevent Moss on a Roof

Moss on a roof can pose a structural problem if you don't tend to it. There are some things you can do to clean up and remove any moss that may be growing on top of your home. Once you remove the moss, you must take steps to discourage another growth.

Things You'll Need

• Pruning shears
• Chain saw
• Broom
• Pressure washer
• Zinc strips
• Zinc sulfate

Instructions

1. Trim the trees near your house. You don't need to cut them down, just trim enough branches so that more sunlight reaches your rooftop. Use a chain saw for the larger branches and pruning shears for the smaller ones.

2. Clean your roof twice a year in damp climates. Remove leaves, twigs, needles and other matter that can retain water and promote moss growth. Clean the gutters and the clips that hold the guttering in place.

3. Wash your roof, using a water hose with a spray nozzle. Start at the top of the roof and work your way down. Sweep a broom over the dampened roof to loosen and remove any remaining moss.

4. Use a pressure washer if the moss problem resists your efforts. Don't apply pressure too long in one spot, or you may damage your roof.

5. Nail zinc strips near the peak of the roof to prevent future moss growth. Rain will dissolve some of the zinc until it runs down the roof. This mineral retards moss growth.

6. Apply zinc sulfate directly on the moss on a dry roof. This compound kills moss after three to four weeks of wet weather.

Tips & Warnings

• Climbing on your roof can be dangerous. If your roof has a steep pitch, hire a professional who has the right tools to do the job.

• Because concentrations of zinc sulfate can be harmful to fish as it runs off a roof, use zinc sulfate sparingly and as a last resort.