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Depends on the pitch and how dirty the roof is, but on the ave.. 2000 sq ft, play with it,

KID

Welcome Robo, this is the best and only site dedicated to non-pressure roof cleaning I will tell you like the founder and other Pros told me.. READ READ READ everything you need to know is here, use  the search to find what you need,after reading  reading reading feel free to ask and post away..
Good Luck  and again, Welcome

KID

Robocop,
I am willing to bet most of your question that you may have has already been answered in other post and topics. Like Kid said get fimiliar with the search feature. Type in your question and your answer shall be found with a little reading.

Start with the home page and go from there. They are the main topics and subjects. If you still have questions after reading all that then feel free to post your questions we are here to help.

-- Edited by miked on Tuesday 9th of June 2009 06:28:55 PM

well the house wash is either downstreamed or x jetted on the surface.

Roof mix is applied with high volume low pressure using the set ups that are listed on the forum

i am not a veteran by any means but this is from the spray and forget website
"Q:  How long will it take for roof stains to disappear using the “no rinse” application method?
A: The stains will disappear in 6-9 months, on average, using 9 gallons water to one gallon of Spray & Forget mixture.  A stronger concentration can be used to expedite the process.  For example, a 5:1 mix will remove the stains in about 3-6 months on average.  The removal time is also dependent on rainfall and the severity of the infestation."
With LOVE I saw the first part of the roof i sprayed without steaks by the time i was getting down from the ladder. So i am not sure why you are interested in what Chemicals are in this stuff. Yeah it will work eventually. With LOVE you see results immediately and it continues to work as well. my 2 cents

Univar cut me off. :(

They will no longer sell me chemicals without a CDL and Hazmat certifications.

I am now buying from a middleman company called Water Tech who orders from Brenntag.

Good news is they deliver to my house and their 12.5% bleach is way stronger than Univars.

I am now cutting my bleach down to 33% and getting great results.

Weird, it's labeled the same- 12.5% sodium hypochlorite and I can tell a big difference in the strength coming from the different supplier.

-- Edited by Roof Cleaning Pro Greensboro NC (336)362 7659 on Tuesday 14th of July 2009 05:06:12 PM

I tested several of these roof cleaning chemicals prior to Apple Cider.  None of them gave the results you get with Apple Cider Sauce.  I did have some success with M1 Roof Cleaner from JOMAPS.  The problem was you needed to rinse and rinse and rinse to get results.  I still use JOMAPS  product for siding, gutters, and walkways.

Is there a substitute for TPS besides Borax.  I cann't find TPS in Maryland and have been using  Borax with the same problems of the time it takes to dilute in hot water.

Has anyone used TSP PF (Phosphate Free)?  It was the only thing available at a local home improvement store.  Doesn't matter for me since I can still get regular TSP at Lowes.  Just wondering if the PF means anything to us.