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pallen123's avatar

What's the best way to get moss off of asphalt shingle roof?

Asked by pallen123 (1514points) June 19th, 2009

We live in northeastern Ohio and have a dark/black asphalt shingle roof that nearing replacement age—maybe 3–4 more years. There’s a good deal of moss growing on parts of the roof. Any suggestions for getting it off/dead? Thought about bleach solution, but don’t want to discolor the shingles. Not sure I want to powerwash it—it’s on the second floor. Ideas? Thank you!

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7 Answers

jrpowell's avatar

We had to deal with this a few years ago. We went with a pressure washer. It was a huge pain in the ass. If you do make sure you spray down. Start at the top. But we banged out 2000 square feet in a day. It goes really fast.

YARNLADY's avatar

You can purchase dry granules/powder from any roofing supply store to sprinkle on it. It’s a Zinc & Copper mixture used in horticulture as trace minerals and here we spray it on citrus trees to eliminate and prevent the black sooty mold.

SeventhSense's avatar

It’s my business- Powerwash with a mildewcide solution. The solution is hardly even necessary with the right equipment
If you’re not comfortable hire someone.

rooeytoo's avatar

I always used bleach but you are right will change the color of the shingles and everything else it touches. Probably the environmentalists would hate you as well.

I hate using powerwashers unless you wear scuba gear and it could be hard to walk on the roof in flippers.

@YARNLADY‘s suggestion sounds like a winner to me.

SeventhSense's avatar

@rooeytoo
Yes but there are ways to do it very safely like I mentioned. And in fact there really is no other way. You can scrape it off by hand and scrub it with a brush but that would even be more dangerous. Here’s another image of a guy doing it safely.

rooeytoo's avatar

@SeventhSense – I should have looked at your first link, when I hear power washer, I was thinking of one with just a hose and nozzle on the end. I have a love/hate relationship with them.

The one you show looks like a winner. Thanks for the information. I still think I would hire a professional though, I am sure there are tricks of the trade that make the job easier and safer!

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