How Do I Kill Green Moss on My Roof?


Green moss grows on roofs that experience high levels of rainfall and humidity. If left on the roof, moss can damage the shingle quality by causing the wood underneath the shingles to rot, since the area is significantly more damp than roofs without moss. Moss is easy to kill and remove from the roof, and homeowners who remove the moss will make their roofs look more attractive.

Things You'll Need

  • Ladder
  • Stiff-bristled scrub brush
  • Garbage bag
  • Chemical soap
  • Water
  • Spray bottle
  • Pressure washer

Natural Method

  • Carrying a stiff-bristled scrub brush, climb up on your roof.

  • Scrub the moss clusters with your scrub brush to tear them out from the roof. Moss has shallow roots, so it should come up fairly easily when you scrub it. With its roots pulled up, the moss plant will die.

  • Collect the moss clusters in a garbage bag. Dispose of them in the trash or compost where they will biodegrade.

Chemical Method

  • Mix a chemical soap designed to kill moss with water, following the instructions on the soap's label, since different brands have different proportions. Fill a spray bottle with the soap solution.

  • With the spray bottle in hand, climb up to your roof.

  • Spray the moss with the soap, squirting until you have thoroughly soaked the moss clusters. The chemical soap will kill the moss on contact.

  • Wash the roof with a pressure washer to remove the dead moss. You'll need to run the pressure washer up the roof, and may need to attach an extension hose so it can reach far enough. Stand toward one edge of the roof, and spray in a 5-foot swath to reach the edge of the roof. Then step back 5 feet, and spray the next length of roof. When you reach the center of the roof, step over to the other edge, and repeat this process to finish removing the dead moss.

Tips & Warnings

  • Be careful when working on a roof, since it is easy to fall off or fall down, especially when working with water.

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  • Photo Credit Moss image by Yaroslav Knish from
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