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Old 10-14-2007, 08:09 AM   #1
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Cleaning roof ?


Greetings--

Our composisition roof has black "stains" on it here and there. Also, where water runs off (no guters), it leaves black stains on the brick. IN addition, where water runs off the roof, over the alum. poarch and onto the patio--black staqins in the concrete.

It looks like mold, as the patio get slippery. I power wash it and its good as new.

No close trees so the entire roof gets sun during the day.

How does one go about cleaning a roof-- and preventing it from reoccuring ?

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Old 10-14-2007, 10:54 AM   #2
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Cleaning roof ?


Here you go:ALGAE Shows as black streaks on shingle roofs
MOSS Small flowerless plant, grows on all types of roof material, Grows in shady moist areas
LICHENS Plant that grows in small patches

To control moss and lichens, use the following:
1 cup Trisodiumphosphate
1 gallon Bleach
4 gallons Water
Mix together spray on roof with garden sprayer. Leave set for 20 to 30 minutes. Rinse off with clear water from a garden hose. The roof may need to be retreated every 3 to 4 years unless the conditions that caused the growth are changed.

The trisodiumphosphate should be able to be found locally at hardware stores or larger lawn and garden shops.
good luck!

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Old 10-14-2007, 05:07 PM   #3
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*bowing* Thanks RG--
I assume the same mix for Algae ?
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Old 10-14-2007, 05:52 PM   #4
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Cleaning roof ?


yes,and you could purchase zinc strips to place by the top of the roof the runoff from zinc kills it also
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Old 10-17-2007, 08:30 AM   #5
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Cleaning roof ?


Great advise as far as the cleaning goes that is also what most of the major shingle manufacturers recommend using to clean algae infected shingles.

I've heard good and bad things about the zinc strips. Here is a pic of a house with the strips, it seems they only protect a couple of feet down the roof.
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Old 05-27-2008, 01:42 PM   #6
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Cleaning roof ?


Barry is correct.
Zinc Strips do not keep the whole roof clean, especially here in the Tampa Florida area.
A better plan is to spray the roof once a year with a bleach/water/Borax solution.
You need 50 percent each of water and bleach, and 1/2 cup of Borax per gallon of mix
TSP is a FERTILIZER and a potent cleaner.
It will NOT prevent algae.
The bleach will kill the algae, and the Borax will help prevent re growth, preventing roof cleaning.
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Old 05-27-2008, 01:46 PM   #7
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Cleaning roof ?


How do you collect the run-off from something like that (on a roof with no gutters) so it doesn't kill the plants below?
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Old 05-27-2008, 01:58 PM   #8
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Cleaning roof ?


Quote:
Originally Posted by NateHanson View Post
How do you collect the run-off from something like that (on a roof with no gutters) so it doesn't kill the plants below?
You wet all the plants down on the side of the roof you are doing first.
Then, you start spraying, and a person on the ground immediately dilutes the run off.
The diluted run off is harmless if diluted right away.
Let the run off sit on plants, then rinse, and you will have trouble.'
Tarps are better then nothing, and sometimes you can get away with them.
But a man on the ground watering while you spray is the best overall situation.
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Old 04-03-2010, 02:09 PM   #9
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Cleaning roof ?


Old post, but great info. Chris and Barry are dead on. Those zinc strips are more of a scam in the roof cleaning industry. Very ineffective.

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Old 04-05-2010, 11:43 AM   #10
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If you can't collect the toxic bleach runoff you can use oxygen bleach, it's very effective, and won't kill your shrubs. The chemical is called sodium percarbonate, and is sold under many brands (it's the active ingredient in oxyclean, but that stuff is heavily diluted and overpriced). Stainsolver.com has high-concentration formula at a very good price.
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Old 04-13-2010, 04:17 PM   #11
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Tried today to clean my roof and results were not great. Used instructions as above and I would say it's only about 30% better. I will wait few days and repeat agin if it would help.

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