Kleen Roof and Exterior Cleaning wrote:

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Would it stand to reason then, if a roof has moss and lichen it would be better to treat it 2 or 3 times with a weaker mix(2-3%) to kill the hardy invasive species ? And if a roof is only got black streaks a stronger mix (4-5%) would take care of it in one pass.

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I assume when you say 2-5% you are giving the actual SH % ?

10% pool chlorine, mixed 50 gallons SH to 50 gallons water, is really 5% -not 50%.

So, if that's what you are saying [ of course, I have no real experience with mold and very little with lichen here in SW Florida ] Then I would say yes. 2 or 3 treatments at 2.5% - in my estimation, would do a more thourough job of destroying/killing. But, from what I understand, with mold, doesn't it have to then be blown off with a garden hose or mild pressure washing, to get it off the roof?

Clearly, the stronger 5% [often referred to as 50% SH / 50% water] would clean the roof faster, but not disinfect / kill mold-algae spores as well.

Mr Maintenance wrote:

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 What don't you understand, tell me and I will explain 

Bergman Roof Cleaning Port Charlotte FL 941-698-1959 wrote:

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I understand. While the higher SH level in a cleaning mix cleans faster, it does not have the PH level to destroy the disease-causing organisms. The lower SH level, with more water, cleans slower but has more ability to destroy the disease-causing organisms.
While I understand the explanation, I would like to put it to a test. :)
The reason is, I do a number of small HOA developments -I mean small ones, like up to 15 houses on a circle drive etc. When I do 5 in a row one year, 2 years later, the one in the middle , or whatever, may be showing some small amount of algae growth, while the other 3 or 4 may look like I just did them.
So, I have come to see that even 5 tile roofs in a row are not going to stay clean the same length of time, even when cleaned with the same 45% SH mix used on them all.
Interesting facts and thought though!

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 At weaker levels (more water in the mix) the PH drops because of all that water. As PH drops in chlorine, the hyperchlorus begins to dominate. This is the disinfectant part of the chlorine, and one reason we add acid to swim pools, to drop the PH and disinfect.

At higher PH levels, the hypochlorite Ion appears, and that is what cleans for us. Weaker roof cleaning mixes have BOTH the acid and the hypochlorite  Ion in them!

Strong roof cleaning mixes have only the Hypochlorite Ion, and little to no hyperchlorus acid to kill the algae spores.

This is why when you preventative spray to treat a roof, you only want 20 percent SH to water, and maybe add a little sulferic acid to the mix, but got to be careful not to drop the PH too far, or deadly fumes will form.

Unless one knows what is really going on with the SH, it does not make sense that  a weaker mix can kill algae spores better.

Bergman Roof Cleaning Port Charlotte FL 941-698-1959 wrote:

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You know Chris, this is really quite an important line of thinking!
It opens up a whole new avenue of potential sales! Algae prevention!
I have never sold this, because I hadn't known the facts that you posted!
Man! 24 years of roof cleaning in Florida and I am still learning from you on a very regular basis and I know my business! But, you are a freakin' genius with this stuff!
I came here in 1999, already thinking I knew it all, when it came to roof cleaning. I showed up [to be honest] not willing to let out much info at first. But you kept surprising me with info I didn't already know-mainly this chemist stuff you know! Then I started opening up and answering newbie etc questions. Looking back, I'm sure glad I came here! I'm a smarter roof cleaner for it!!!
Now, I gotta go drink wine with my wife! LOL

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 I Love you too Brother  We are close in age, and both veteran roof cleaners here in Florida, who battle tile roofs everyday!

Go drink some wine my friend, and I will tell you WHERE I see the roof cleaning industry leading someday. But, that's for another thread 

Peter LeBlanc wrote:

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Chuck, I'm here in SWFL tooand I always use a 35% solution of 12% SH. Have you found that solution that you use to be the "right" mix for most tile roofs in SWFL?

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Welcome as a guest reader!

If you get a paid membership here, all your questions will be answered readily, by myself and others.

Many roofs in SW Florida require different mixtures and some require other additives.

Such as this one pictured. I used 2 other additives, besides SH and Water.

Apple Roof Cleaning Tampa FL (813) 655-8777 wrote:

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Bergman Roof Cleaning Port Charlotte FL 941-698-1959 wrote:

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You know Chris, this is really quite an important line of thinking!
It opens up a whole new avenue of potential sales! Algae prevention!
I have never sold this, because I hadn't known the facts that you posted!
Man! 24 years of roof cleaning in Florida and I am still learning from you on a very regular basis and I know my business! But, you are a freakin' genius with this stuff!
I came here in 1999, already thinking I knew it all, when it came to roof cleaning. I showed up [to be honest] not willing to let out much info at first. But you kept surprising me with info I didn't already know-mainly this chemist stuff you know! Then I started opening up and answering newbie etc questions. Looking back, I'm sure glad I came here! I'm a smarter roof cleaner for it!!!
Now, I gotta go drink wine with my wife! LOL

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 I Love you too Brother  We are close in age, and both veteran roof cleaners here in Florida, who battle tile roofs everyday!

Go drink some wine my friend, and I will tell you WHERE I see the roof cleaning industry leading someday. But, that's for another thread 

 

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Yup! We have our brotherly love, because we are, as you said, verteran roof cleaners here in Florida!

And yes, unlike shingled roofs, these tile roofs are a battle! Harder to walk, harder to get clean  and more runoff to fight with!

I fell off a roof in 1991, so I'm a wounded vet!

I would be very interested in hearing where you see the roof cleaning industry leading someday!

I have my own thoughts, but, if yours is like mine, it may be best discussed in a PM!

Bergman Roof Cleaning Port Charlotte FL 941-698-1959 wrote:

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Apple Roof Cleaning Tampa FL (813) 655-8777 wrote:

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Bergman Roof Cleaning Port Charlotte FL 941-698-1959 wrote:

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You know Chris, this is really quite an important line of thinking!
It opens up a whole new avenue of potential sales! Algae prevention!
I have never sold this, because I hadn't known the facts that you posted!
Man! 24 years of roof cleaning in Florida and I am still learning from you on a very regular basis and I know my business! But, you are a freakin' genius with this stuff!
I came here in 1999, already thinking I knew it all, when it came to roof cleaning. I showed up [to be honest] not willing to let out much info at first. But you kept surprising me with info I didn't already know-mainly this chemist stuff you know! Then I started opening up and answering newbie etc questions. Looking back, I'm sure glad I came here! I'm a smarter roof cleaner for it!!!
Now, I gotta go drink wine with my wife! LOL

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 I Love you too Brother  We are close in age, and both veteran roof cleaners here in Florida, who battle tile roofs everyday!

Go drink some wine my friend, and I will tell you WHERE I see the roof cleaning industry leading someday. But, that's for another thread 

 

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Yup! We have our brotherly love, because we are, as you said, verteran roof cleaners here in Florida!

And yes, unlike shingled roofs, these tile roofs are a battle! Harder to walk, harder to get clean  and more runoff to fight with!

I fell off a roof in 1991, so I'm a wounded vet!

I would be very interested in hearing where you see the roof cleaning industry leading someday!

I have my own thoughts, but, if yours is like mine, it may be best discussed in a PM!

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 Yes, a good idea!