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Does Chlorine damage the shingle?
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My friend was telling me last night that as soon as you put chlorine on asphalt shingles that it starts to break it down and in a few years they will need to be replaced.  I told him he was wrong and it helps keep mold and algae off and reduces the heat on the roof and looks almost new.  He was once told by a person (that has been a roofing contractor for 30 years) the only way is to try and clean it and then put some zinc strips at the top and the mold will stay gone.  I am not a roof guy (but would like to try because there are hundreds of homes around me with mold) and could you fill me in on this to let him know he is wrong.

I looked it up on the Asphalt Roofing Manufacturers Association and it specifies:

Algae discolorations are difficult to remove from roofing surfaces, but may be lightened by applying a solution of chlorine bleach, trisodium phosphate, and water. Solutions for these ingredients may vary between shingle manufacturers and depend on the amount of discoloration. Solutions range from one cup TSP, one gallon bleach and five gallons of water, to one cup TSP and 2.5 gallons each of bleach and water.
I appreciate any info.


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map_911


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map_911 wrote:

My friend was telling me last night that as soon as you put chlorine on asphalt shingles that it starts to break it down and in a few years they will need to be replaced.  I told him he was wrong and it helps keep mold and algae off and reduces the heat on the roof and looks almost new.  He was once told by a person (that has been a roofing contractor for 30 years) the only way is to try and clean it and then put some zinc strips at the top and the mold will stay gone.  I am not a roof guy (but would like to try because there are hundreds of homes around me with mold) and could you fill me in on this to let him know he is wrong.

I looked it up on the Asphalt Roofing Manufacturers Association and it specifies:

Algae discolorations are difficult to remove from roofing surfaces, but may be lightened by applying a solution of chlorine bleach, trisodium phosphate, and water. Solutions for these ingredients may vary between shingle manufacturers and depend on the amount of discoloration. Solutions range from one cup TSP, one gallon bleach and five gallons of water, to one cup TSP and 2.5 gallons each of bleach and water.
I appreciate any info.




Well, I think the ARMA bulletin says it all ?

 



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Of course your roofing friend is gonna said that....YOU could vary well take his business!! Why replace a roof when it can be cleaned!?

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If you  want to show him he is wrong , show him  the ARMA bulletin, then he can debate with the manufactures.....

KID :sprint :


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I've been in the business for 20 years. I've dealt with roofers trying to convince homeowners that chlorine will destroy shingles. I'm sure if you were to use straight chlorine regularly on a shingle roof, it will have some effect eventually. However, we maintain a roof on the home of one of the largest roofing companies in Volusia County that just turned 27 years old this year and it looks as thought it was installed recently. (Did I mention that we have maintained it since Oct, 1990) As a matter of fact A1A Roofing presents each of it's customers with our business card and brochure recommending they notify us within 5 years of installation to begin service to prevent fungus growth. .
Please understand, 27 years ago, 30 or 40 year shingles were not available.......

I THINK THIS SHOULD PUT TO REST ANY QUESTIONS ABOUT THE EFFECTS OF PROPERLY MIXED SH TO A  ROOF.

And as Chris stated, the ARMA Bulletion says it all.................

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Thanks for the reply's on my question, I let my friend know what I found out but it's like telling an old dog new tricks.

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map_911


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I have heard some people say that as well. I'd like to know if they have any documentation related to chlorine bleech causing damage.

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pat konen wrote:

I have heard some people say that as well. I'd like to know if they have any documentation related to chlorine bleech causing damage.




They do not Pat.
They simply want to sell their concotions, by bad mouthing, hoping ignorant folks will believe their lies.
Just ignore that crap.

 



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I don't think it matters what you are doing someone will find somthing wrong with it

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Chet Eby
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white fox wrote:

I don't think it matters what you are doing someone will find somthing wrong with it




Yes, you cant please everyone.

 



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I have done several experiments with bleach,sodium hypochlorite,and have found no evidence that bleach or sodium hypochlorite harms asphalt shingle's Roof Clean NC



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Thanks for info Thomas, did you keep the shingle after the test and how long ago was test? I'm curious to see if it started to crack up after a few years of setting around.

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map_911


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YES, i did keep the shingle. it is on my dog',dog house. it has been their for about a month now and i plan on taking some pictures of it in the spring. so far it has not changed a bit.i will take another pic of it if you need it to show a customer if by...

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Roof Clean NC
329 Heathers Folly Rd
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www.trspowerwash.com
Roof Clean NC- Blog
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a picture is worth a thousand words!!!!!!!!!!

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Chet Eby
Shippensburg PA 17257


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map_911 wrote:

My friend was telling me last night that as soon as you put chlorine on asphalt shingles that it starts to break it down and in a few years they will need to be replaced.  I told him he was wrong and it helps keep mold and algae off and reduces the heat on the roof and looks almost new.  He was once told by a person (that has been a roofing contractor for 30 years) the only way is to try and clean it and then put some zinc strips at the top and the mold will stay gone.  I am not a roof guy (but would like to try because there are hundreds of homes around me with mold) and could you fill me in on this to let him know he is wrong.

I looked it up on the Asphalt Roofing Manufacturers Association and it specifies:

Algae discolorations are difficult to remove from roofing surfaces, but may be lightened by applying a solution of chlorine bleach, trisodium phosphate, and water. Solutions for these ingredients may vary between shingle manufacturers and depend on the amount of discoloration. Solutions range from one cup TSP, one gallon bleach and five gallons of water, to one cup TSP and 2.5 gallons each of bleach and water.
I appreciate any info.



This topic has become ridiculous.  We SWIM and HOT TUB  in water treated with chlorine and DRINK water with chlorine added to it to kill bacteria.  City water systems add it and we injest it with the tap water!!!!

 



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There has been plenty of documentation of guys maintaining the same roofs for many years.
 If chlorine damages shingles, these roofs would not be lasting 25+ years , when the average life of untreated shingles is 12=15 years !



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it has to be better for the roof than just letting the mold grow


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Chet Eby
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Hey Chet, are you studying the RCIA Roof Cleaning Manual in that pic?  If not, maybe someone could write one.  How about it Chris?  You write it, I'll buy it!

Long time lurker, first time poster.



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why buy a book when everything you need and more is right here !!!

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I'm just looking for a shortcut.  Maybe I'm a little lazy?  I have learned a TON from this site already! 

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