Products to Remove Moss on a Roof

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Moss growing on your roof is a common sight in humid climates, especially in areas with many cloudy days or on homes with tree branches overhanging the roof. If your roof is the one covered with moss, products are available to help you remove it.

Moss

  • Moss is a form of fungus that can grow on trees, grass and roofs. It doesn't matter if your roof is constructed of wood, asphalt or tile --- moss grows on all types of roofs. While it is not damaging on its own, moss can lead to serious problems. Moss absorbs water. During rainfall, large amounts of moss on a roof will hold enough water to create a large amount of weight on the roof. Over time, this excess weight can cause structural damage.

Small Patches

  • To remove small patches of moss from your roof, use products you probably already have around the house. Pour undiluted white vinegar on the moss. Let it sit for half an hour, and then brush the moss away with a broom. If the vinegar doesn't kill the moss, add 1 cup of liquid household bleach to a gallon of water. Pour the mixture over the moss and let it sit for 15 minutes. Rinse it and the dead moss away with a hose.

Large Patches

  • For larger patches of moss, use commercial products to remove it. Zinc chloride and copper sulfate are both available for purchase at home and garden supply stores. To apply zinc chloride, mix one part zinc chloride and nine parts water. Soak the moss with the solution and let it sit for approximately 20 minutes. Rinse away the dead moss and the solution, using a hose or a pressure washer. For copper sulfate, mix ½ oz. with 10 gallons of water. Apply it to the moss as you would the zinc chloride.

Prevention

  • Although copper sulfate provides some residual protection, none of these products prevent moss from returning. Install zinc or copper strips on your roof to provide lasting protection against moss growth. When working on your roof, it is best to work with a partner and to wear a safety harness in case you fall. Always clean down-slope from where you are standing; this reduces your risk of slipping.

References

  • "500 Simple Home Repair Solutions"; Norman Becker; 2008
  • Photo Credit Jupiterimages/Photos.com/Getty Images
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