11 posts in this topic

Posted

Need some help here.

I was cleaning rust and creosote off from asphalt shingles on sunday using Barc f9 at 1:1 . Very heavy deposits. My problem is, the f9 left the aluminum snow shield with dark streaks. The aluminum was oxidized but now just looks like crap. 

I asked Craig from f9 and he suggested Mothers aluminum polish with a soft polish ball. Im sure it would work but I dont want a shiny polished look. My client didnt really seem too concerned with it but I just wont leave it like that.

Im looking for a spray on rinse off cleaner.

Looked at Bar Keepers Friend. 

Any advice would be appreciated. 

 

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Posted

How did it work on the creosote and on the rust? I have a very badly rust stained roof that a guy needs me to clean. 

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Posted (edited)

F9 works as advertised. Its an awesome product. I will post pics after I clean up the aluminum snow shield. 

Edited by ReNew Roof & Exterior cleaning

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Posted

I would use Oxalic acid. F9 works, but expensive. I cleaned a roof with heavy rust stains and creosote, the oxalic did great. It will take a few times, but works. And, keep everything downstream wet. That way you will not have streaking on anything.

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Posted

Obviously, you'll want to ensure that the ferrous material  (or other source) that caused the rust has been remedied, otherwise the rust will come right back.

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Posted (edited)

I havent tried oxalic acid, I should.

It took 3 coats with f9 at 1:1 but as I said it was real heavy deposits of mostly creosote which has built up for about 15 years. 

F9 isnt really too expensive compared to other chemicals. The expensive part for me is the shipping costs.

Never using oxalic Im not sure what the costs are or how it compares to f9.

Yes Ted I will suggest to my client to paint the metal stack. Its galvanized steel, could be aluminum its polished and only about 24" tall. Single story ranch. 

So my main concern now is the discolored aluminum. I could clean with an aluminum polish and use a metal etching chemical to help make it look closer to the rest of the oxidized snow shield or just clean it up and tell them it will oxidize over time.

Edited by ReNew Roof & Exterior cleaning

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Posted

I tried some Oxalic acid mixed 10oz dry to 1 gallon of hot water. Didnt seem to work very well. It did pull up some of the creosote buy I may have mixed it too weak.

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Posted

I have used oxalic acid before. It is good in removing stains and rusts.  

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Posted

I did a roof with heavy rust stains and it has come out almost completely using ox. I seem to be getting more roofs with rust stains from the chimney stack. I have added a before and after. The ox is far less expensive than the F9 and works really well.  

20160924_171643.jpg

20160925_175248.jpg

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Posted

Looks nice, what did you use for a mix ratio?

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Posted

I used 8 Oz to a gallon.  

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