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Question DetailsAsked on 10/30/2013

how do I remove mold from my roof shingle

fungus & mold on roof shingle

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2 Answers


There are products that are very easy to apply that you can get at the big box home centers. If you are not afraid to go up a ladder it can be a do it yourself job. One I have used just screws on to your garden hose and is a spray it and forget it type of application. Once the procuct is on it kills the moss and mold and rain will wash it away. I would not recomend power washing a roof due to the damage that can be done by an inexperienced person.


Answered 7 years ago by ContractorDon


Generally, it is recommended to kill the mold or moss, then broom and hose it off, then recoat with the product as a preventative. this initial cleaning gets rid of the dust and organic materials that it uses for food. MossOut by Lilly Miller is the one I use - is essentially a zinc compound that poisons the mold and moss and lichen (though I have one type of orange lichen that seems to like it and has to be sprayed with bleach to kill it).

Works best to, when several days dry weather is forecast, use the concentrate and spray it on with a garden sprayer (be sure to wash out good afterwards as corrosive to metal parts) so you get full coverage, let sit for a week or two till the mold and moss dies (turns color), then use a jet nozzle on a hose (this general type -

not an intense jet like from a pressure washer, to hose it off. Then reapply - the concrentrate washes off easily, so I recommend using the MossOut powder for the preventative treatment - you sprinkle it over the surface as granules - last much longer, gradually bleeding down over the roof when it is wet to prevent regrowth. I recoat every 2-3 years and have not had to scrub moss or mold off my roof for about 10 years, though I have no overhanging and few close trees, so mine is not a severe condition roof.

Note - make sure your downspouts do not dump within about 3 feet of any prized trees or shrubs, as it can kill them - normally does not seriously damage lawn, though it does yellow it come after firsst couple of rains after cleaning and powder application.

Answered 6 years ago by LCD

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