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Post Info TOPIC: Rust on a roof


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Date: Aug 29, 2009
Rust on a roof
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I looked for a thread that talked about rust on a shingle roof--no luck.  I did a roof today that had a lot of run off from the stink pipe and had some good rust still on the roof.  I thought about using some CLR but not too sure about that.  Anyone have any recipes to get it off?  I don't want to leave it, but I don't know how CLR would react on the roof.  Any insight would be appreciated!

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Date: Aug 30, 2009
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confuseIts posted but it doesn't come up under Rust ? http://roof-cleaning-institute.activeboard.com/index.spark?aBID=123190&p=3&topicID=27476833 I myself had not had 100% results with rust stains i've used 3 types and tried even full strength , the same goes for soot stains from oil burners i find these stains on the prefab chimney, not the brick style,must be the style of the cap i also find that this style chimney has rust stains on the shingles either from the stainless starting to rust or the sheet metal screws they used to put the sections together or both

-- Edited by Roof Cleaning Long Island New York (631) 220 6985 on Sunday 30th of August 2009 10:07:19 AM

-- Edited by Roof Cleaning Long Island New York (631) 220 6985 on Sunday 30th of August 2009 10:10:45 AM

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Roof Cleaning Long Island New York (631) 220 6985


Premium Member Roof Cleaning Institute of America Certified Roof Cleaning Specialist

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Date: Aug 30, 2009
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I've been using a mixture of 85% Phosphoric acid and a little Muratic acid. (hydrochloric acid)

85% P.acid is thick and has good cling and muiratic acid gives it extra strength.

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Date: Aug 30, 2009
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confuseThanks Mike , do you dilute it with water or just 85/15 on the mix and do you brush, pump spray ? and how long do you leave it on also where is phosphoric acid sold wow thats a lot of questions lol

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Roof Cleaning Long Island New York (631) 220 6985


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Date: Aug 31, 2009
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Oxallic acid does a good job on rust stains. It is the main ingredient in Olympic Deck Brightener that they sell at Home Depot or Lowes if you need to find it locally and cannot.

Brian

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Date: Aug 31, 2009
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Try oxalic acid, or Rust Aid from home depot. 

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Date: Sep 1, 2009
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Thanks for all the advice. I used Super Iron Out and got 99% of the rust out. The HO was fine with that because it was just going to come back when that stink pipe rusts out more.

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Date: Sep 6, 2009
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Roof Cleaning Long Island New York (631) 220 6985 wrote:

confuseThanks Mike , do you dilute it with water or just 85/15 on the mix and do you brush, pump spray ? and how long do you leave it on also where is phosphoric acid sold wow thats a lot of questions lol




For roof cleaning I cut it down with a little water to make it spray better using my pump sprayer.

85% is the strongest phosphoric acid you can get.  Univar or Brenntag sells it.

Adding a little muratic acid to it really helps.

For vinyl siding and concrete I just use a bucket and a brush.

I may or may not cut it down with water depending on how bad the rust stains are.

Like Brian says Oxalic acid also works, Larry in Florida uses sulfuric acid.



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Date: Sep 6, 2009
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confuse Thanks for the info Mike

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Roof Cleaning Long Island New York (631) 220 6985


Guest

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Date: Oct 4, 2009
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use a hydrofluoric based product for rust

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Ada Mobile Wash

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Grand Rapids, MI 49525


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Roof Washing Exterior House Cleaning Grand Rapids, MI



Premium Member Roof Cleaning Institute Of America Certified Roof Cleaning Specialist-MODERATOR

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Date: Oct 4, 2009
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Actually the product I use the most has sulfuric and hydrofluoric acid in it. it's made here locally. ( Pink Stuff) I also use Super Iron out on Battery acid stains, iron funiture stains etc... on concrete and Rust Aide from time to time for removing sulfur Rust from sprinklers.

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Date: Oct 4, 2009
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Yes, i believe the HF does the work but they put in Sulfuric because of the smell.  The HF i use does not really have a scent so you can get in real trouble with it if you dont know what you are doing.  Kind of like how natural gas doesn't smell but they add rotten egg smell so you know when there is a leak.  HF does not really burn the skin but soaks in and kicks your arse later after its too latefurious.  Pretty insidious stuff, but boy does it work on rust.  Faster than love on algae, im talking right NOW.  Of course, keep everything wet and rinse well, it smokes greenery super easily.

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Ada Mobile Wash

2694 Ashville Dr. NE

Grand Rapids, MI 49525


616-285-8115

kennethpaul@vzw.blackberry.net


Roof Washing Exterior House Cleaning Grand Rapids, MI



Premium Member Roof Cleaning Institute of America Certified Roof Cleaning Specialist

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Date: Oct 4, 2009
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I heard of a guy who put his nose in a drum of 47% hydrofluoric acid to smell it and he was sick for 3 days just from breathing the fumes.

I have heard to work with HF safely, use it around 5% in case you get some on your skin it won't kill you, otherwise you are risking your life or a long hospital visit.

I've never worked with it though, this is what a local pro told me once.


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Guest

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Date: Oct 5, 2009
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I know a guy that had a five gallon bucket of HF in his work van. He left the cap off the pour spout and ended up with a puddle of HF on top of the five gallon bucket as he drove around for a week. Doesn't sound so bad right? Well he proceeded to SIT DOWN on said bucket to work on some equipment in the van. A few days later he wasn't sitting at all and couldn't for about 3 weeks disbelief.gif

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Ada Mobile Wash

2694 Ashville Dr. NE

Grand Rapids, MI 49525


616-285-8115

kennethpaul@vzw.blackberry.net


Roof Washing Exterior House Cleaning Grand Rapids, MI



guest

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Date: Oct 5, 2009
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I seen a reply that said to use oxalic acid, its generally used as a wood brightner and its safe to handle. I personally don't know but thats what I would try.



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Date: Oct 5, 2009
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I have never tried Phosphoric Acid on a roof, but this thread suggest it, instead of Muriatic Acid.
http://www.hotrodders.com/forum/muriatic-acid-rust-removal-133307.html



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