How to Wash a Roof
Roofs become dirty and collect mold and fungus, which can be a health hazard. Mold and fungus also absorb heat, which may result in greater utility costs. Roofs should be cleaned on an as-needed basis. This will vary depending on an area's climate and how rapidly mold and fungus grow. Mold and fungus tend to grow faster in areas with warm temperatures and high humidity. As a rule of thumb, a roof should be cleaned every 3 years. Does this Spark an idea?
Instructions
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Rent or purchase a power washer. Rental supply companies have power washers to rent or you can buy one from a home supply store. Pressure washers deliver water pressure at different rates. Too much pressure can break down clay and shingle roofs. Use a pressure washer that delivers water at 1,000 to 2,000 PSI. Metal roofs are more durable and can withstand a higher water pressure.
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Buy a quality detergent to use with the pressure washer. Avoid chemicals such as bleach that can drip on the siding of a home and stain it. Look for environmentally safe pressure washer cleaners at home supply stores such as Lowe's or Home Depot.
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Prepare your roof by removing any tree branches that will interfere with the cleaning process and by cleaning out gutters.
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Put on goggles to protect your eyes from potential hazards during the cleaning process.
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Start at the highest point on the roof and work your way down, spraying everything with the detergent. Follow with plenty of water to wash off mold and fungus. You may want to test a small area of the roof first to make sure the water pressure is adjusted correctly.
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Rinse the detergent off the roof with plenty of clean water.
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Tips & Warnings
Be sure your ladder is secure when you are climbing up and down to wash your roof. If you are afraid of heights, consider hiring a professional to wash your roof.
