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Question DetailsAsked on 7/3/2017

Does it help to get roof shingles cleaned

If my roof has discolorations on it from fungus does it help to get it cleaned

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1 Answer


More likely moss, mold or algae - but at any rate, below are some previous similar questions with a bunch of answers which should help.

If just a discoloration (commonly algae) and assuming these are not rust streaks from cheap fasteners, just putting on Lilly Miller MossOut for Roofs (I like the 4# cardboard shaker tubes - has good "salt shaker" type holes and is easy to spread evenly and about right amount for normal size roof) will normally solve it. If there is a physical buildup of thickness then more likely mold or moss and will likely need cleaning after the MossOut has had a few weeks to month or so to kill it so it comes off easier.

[If you have a roof tht should not be walked on, like tiles, then spray-on type which can be applied from the eaves is the solution].

And of course if the roof needs washing to remove the killed material, the material washed off the roof should be washed out of the gutters too, and then the MossOut has to be reapplied to the roof as a preventative against future similar problems. Can last from about 3-10 years depending on how heavy rains are in your area, and of course washing the roof removes some too so if you have to wash annually to remove tree debris that increases the needed replacement frequency. Using a leaf-blower to clean the roof eliminates that issue and is a lot quicker too, but may not work with heavy fine tree debris or a lot of blown-on dust in some areas.

Answered 3 years ago by LCD

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