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Home Repair - - If it ain't broken, don't fix it. Otherwise look here.
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Posted by higgledy on June 11, 2006, 9:42 pm
Anybody have any expereince using this product to clean black algae
from an asphalt roof?
http://www.sprayandforget.com/products.asp
=
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Posted by on June 12, 2006, 5:24 am
>Anybody have any expereince using this product to clean black algae
>from an asphalt roof?
>
>http://www.sprayandforget.com/products.asp
>
>=
I dont know...... I FORGOT !!!!!!!
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Posted by higgledy on June 12, 2006, 10:00 pm
You are funny!
...............@.................. wrote:
>
> >Anybody have any expereince using this product to clean black algae
> >from an asphalt roof?
> >
> >http://www.sprayandforget.com/products.asp
> >
> >=
>
> I dont know...... I FORGOT !!!!!!!
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Posted by on June 12, 2006, 10:06 pm
That really looks suspicious. How do you have a FAQ and not mention
what the active ingredient is ?
Here's an answer from This Old House, I'll leave it to the reader to
decide who's more believable, some twit with a website selling mystery
fluid or a PBS show that's been around for 20 years:
"The black mold-like stains and streaks that appear on roofs,
particularly light-colored asphalt shingles, is actually a blue-green
algae (Gloeocapsa magma). Commonly found in climates with warm, humid
summers, it does no damage to the roofing, but it certainly does looks
bad.
You could replace all the roofing with new shingles dark enough to
disguise the staining, or with shingles laced with copper granules,
which are lethal to algae. But that would only make sense if the
shingles were worn out.
The less expensive solution is to spray wash the roof with a 50 percent
mix of water and bleach to get rid of the algae. (No pressure washers,
please. They're likely to damage the shingles.) Just be sure to wet
your foundation plantings first, and rinse everything in clean water
when you're done. Plants don't like bleach, and wetting them with
plain water first protects them.
To keep the algae from coming back, insert 6-inch-wide strips of zinc
or copper under the row of shingling closest to the roof peak, leaving
an inch or two of the lower edge exposed to the weather. That way
whenever it rains, some of the metal molecules will wash down the roof
and kill any algae trying to regain a foothold on your shingles.
You can probably see this same principle working on roofs in your
neighborhood. Look for chimneys with copper flashing; the areas
directly below the flashing will be free of any algae stains.
The strips also work on roofs suffering from moss buildup. Just scrub
it off first with a brush, then bleach as above. "
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Posted by Bob (but not THAT Bob) on June 14, 2006, 12:18 am
higgledy wrote:
>
> Anybody have any expereince using this product to clean black algae
> from an asphalt roof?
>
> http://www.sprayandforget.com/products.asp
>
> =
I'd skip the "spray" part and go directly to "forget it".
Investigate the reason for the problem, like an overhanging tree that
should either be cut back or removed.
From my recent experience, where there's moss and/or algae, there's also
rot and critters.
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