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  #1  
Old 04-26-2007, 09:37 PM
jeremy067390 jeremy067390 is offline
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what gets black off the roof

i dont know what to use foor that black bleeding on the roof. i tried stuff from xterior that was for the houses said it didnt that too. nope. pored the chlorine right on there nope. ive been able to thin it out with pressure but thats about it. ive got two jobs in limbo some1 help me out
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Old 04-27-2007, 06:59 AM
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FCPWLLC FCPWLLC is offline
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Sodium Hypochlorite and TSP. Here is the recommended Tech Bulletin from ARMA... http://www.asphaltroofing.org/pdf/tb_217.pdf

And GAF http://www.gaf.com/Content/Documents/22710.pdf

It is just Algae.
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Old 04-27-2007, 07:17 AM
Duekster Duekster is offline
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Yep, chlorine is a good killer but does not have any surfactants and will not clean. The TSP will do that.
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Old 04-27-2007, 08:01 AM
GreenN'Clean GreenN'Clean is offline
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I've noticed the Black Bleeding only happens on cheap shingles I had a customer want me to power wash his roof last year but I turned it down because the shingles was cheap and I didn't want to damage the shingles and then have to put on a new roof...
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Old 04-27-2007, 08:49 AM
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FCPWLLC FCPWLLC is offline
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More often than not, what you describe as bleeding, is just Algae stains.

Simple application of sodium Hypochlorite and TSP followed by a rinse with Garden Hose is all that is needed. No Pressure washer involved.
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Old 04-27-2007, 11:17 AM
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squirtgun squirtgun is offline
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The black bleeding is not from the shingles.It's a form of algae that feeds on the limestone in the shingles.It does matter how much an asphalt shingle cost eventually they will all get it.
We us ethe same method as Michael with outstanding results.
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  #7  
Old 04-28-2007, 11:10 AM
Markf Markf is offline
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Gentlemen,
Thank you for the advise. My own home is experiencing this as well. And after reading this it makes sense because it is only on the north side.
Mark
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Old 04-28-2007, 07:40 PM
jeremy067390 jeremy067390 is offline
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thanks thats awsome. any luck with this on gutters? i use a product from xterior called gutter zap now and a long a#$ brush. works great but i have to order it.
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Old 05-02-2007, 11:00 AM
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1MajorTom 1MajorTom is offline
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Very interesting. I've seen lots of roofs that have that staining, and I've always wondered what caused it. I too thought it must be "cheap shingles".
thanks,
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Old 05-02-2007, 11:40 AM
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Grass Man Grass Man is offline
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Wink

.... Thanks for the info .

.
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