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Posted by Ray K on June 24, 2008, 7:20 pm
Ken wrote:
> spamTHISbrp@yahoo.com wrote:
>>> When a roof has copper or galvanized items (vent pipes, exhaust fans,
>>> etc.) protruding from it, shingles below these items will be free of
>>> algae stains because rain washes copper or zinc from the galvanized
>>> items off and kills the algae. Has anyone heard of using a copper or
>>> zinc solution in a hose end sprayer to clean remove the stains? If so,
>>> which chemical, what concentration, and what coverage?
>>>
>>> I'm experimenting with more conventional approaches (oxygen bleach,
>>> laundry detergent, and a produce called KrudKutter). All require
>>> multiple applications, "scrubbing" with a broom, and generous rinsing.
>>> There may be other proprietary (expensive) items that are more
>>> effective
>>> and easier to use, but for now I'm looking for shortcuts.
>>>
>>> Thanks,
>>>
>>> Ray
>>
>>
>> Roof zinc strip?
>> Just install, let the rain do the work. Don't know how fast the stains
>> will fade, though.
>>
>>
>> Dave
>
> You are correct about the zinc being responsible for SOME killing
> of the algae/fungus. I guess depending upon where you live, the
> results of such strips will vary? All I can say is that in the south
> where the humidity is high and the temperature is also, the strips do
> not work very well. There IS an improvement, but I do not see it as
> worth the effort.
>
> Some years ago I attempted to remove the stains from my roof with
> a chemical made especially for this purpose. You can buy it at Home
> Depot I believe. It is mixed with bleach, sprayed on with a tank
> sprayer, and washed off with a hose or pressure washer at low
> pressure. The results were NOT total, but there WAS an improvement.
> The real problem was that the improvement was only temporary and if
> your neighbors had the same problem, it was sure to return next year,
> albeit not as bad.
>
> If someone wants to make a fortune, they should find something
> that solves this problem and mix it into the asphalt used to make the
> shingle. As of this moment I do not think there is anything that
> really prevents the problem 100%. If there is, I would like to hear
> about it.
The problem is caused by the limestone used in the construction of
current shingles. It acts as food for algae. There are shingles made
with embedded copper granules in them that prevent the algae problem.
You just have know they exist and specify them.
The problem with adding zinc strips is that they will take too long to
work. That's why I was wondering if there is a zinc (or copper) solution
I could just spray on the roof to remove the stains fast.
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