DIY Home Improvement, Remodeling & Repair Forum > DIY Home Improvement > Roofing and Siding > Moss on asphalt shingle roof




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Old 08-02-2014, 08:40 AM  
DFBonnett
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Default Moss on asphalt shingle roof

Because of heavy shade there is moss on an 8 year old asphalt shingle roof. Removing the trees is not an option at this time, nor is getting on the roof to remove the moss manually. I have sprayed with a strong bleach solution and that worked to a degree but my concern is damaging the shingles. Any advice about a preferable product or method would be most appreciated.


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Old 08-02-2014, 09:21 AM  
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The less activity you have on the roof the better off for the life cycle of your asphalt shingles.

That being said, ABC Roofing Supply sells a product called "Shingle Shield" that I've used with varying degrees of success. It's is a concentrate that you mix with water and spray with a garden sprayer and rinse with a water hose. Avoid any pressure washer use on the roof, cause it will dislodge your shingle granules and shorten the lifespan of the roof. Repeated applications may be required.

There are Zinc strips that can be installed along the ridge and hips that help to some extent with keeping roofs clean to some extent. If you've ever noticed clean areas below a chimney, it's the wash off from the copper that creates an environment that is not conducive to mold, algae and organic growth.

Next time you have a roof installed, ask that an algae resistant shingle is installed. There are zinc granules incorporated in with the stone granules to help keep organic growth down. If you have a AR shingle, call the MFG and make a claim. They may pay to have a professional clean the roof.


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Old 08-02-2014, 10:21 AM  
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If all else fails, for a small area I guess you could heat the roof from underneath. Wood insulates somewhat so perhaps small holes in the sheathing may help with heating the shingles with violating structural rules.

But, how long will it take to know if this works? How fast can you kill that moss with a hair dryer?
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Old 08-02-2014, 12:36 PM  
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Quote:
Originally Posted by Wuzzat? View Post
If all else fails, for a small area I guess you could heat the roof from underneath.
Are you serious?
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Old 08-02-2014, 12:54 PM  
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Last time I drilled holes in my roof it leaked.
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Old 08-02-2014, 02:22 PM  
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Just the plywood underlayment. Not through holes.

The trick is to make the shingles hot enough to kill the moss but
not hot enough to unduly shorten the life of the shingles.

I have to be more literal.

Maybe reducing attic ventilation will help, over time.

BTW, darker shingles should work better at preventing moss because they will absorb more light and so be hotter, on average.

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Old 08-02-2014, 02:36 PM  
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I disagree with everything you've posted here. If you don't have proof that taking these actions work, please don't post them because it will void any warranties available from the shingle MFG's. And you will have a unknowing homeowner doing damage to their home that will cost lots of $$$ to fix.
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Old 08-02-2014, 02:47 PM  
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Feel free to delete my posts. Whatever I post that this forum can use, use it. Otherwise, out with it.

Proving what is posted on any forum is a pretty heavy burden, though.

http://en.wikipedia.org/wiki/Burden_of_proof

I'd hope that what I post is "more likely than not" to work (the 51% rule). The "beyond a reasonable doubt" (>95%) level I cannot guarantee, sometimes even with electrical matters.

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Old 08-02-2014, 07:31 PM  
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OldDog ... Interested in the zinc strips ... Can they be applied in long runs above and spaced within the area with moss? A one time remedial repair to the roof could be the answer here. I like the idea ...
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Old 08-02-2014, 07:40 PM  
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I think thats just a tad more than the zinc strips can handle. Yes, they are applied the whole run of the ridge, just below the shingle cap. Then run at a diagonal down the hips (if there are hip) so you have wash off on the entire roof.

We did a huge slate roof that had previous staining. We fabricate a copper strip that was exposed just below the ridge capping so we got wash off of the copper all along the ridge and hips. From the ground you could barely see it.


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