Rust On Hardie Siding

Casey Anderson

New member
I have to quote a customer on a house wash that has Hardie Fiber Cement siding.

What should I use to get the rust off the lower portion without taking the finish off? I have used F9 BARC before but only on concrete.

Also, notice the color differences in the finish on the upper part of the house. Could that be oxidation or just a bad paint job? I really did not get any oxidized paint off with the wet finger test on a lower portion.

Any advice would be appreciated. The north side has quite a lot of mold that I know we can get off with house wash, but I do not want to have to repaint this guys house.
 

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johnnyb

New member
Curious of what others have to say about that horizontal line where it's night and day color difference.

All I can say for sure, set job expectations now haha. FL ppl would expect a fully furnished new house by the time you were done.
 

Chris Dubbs

Member
Looks like two different paints starting at the bottom of the lower windows. F9 the rust, then wet the siding, the wash house, then re rinse. Point out paint issues before starting job.


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WASH-IT H.B.

New member
Just tell the customer you can make it clean but you can't make it new. Paint restoration is not part of the service you are offering. After all it's a pressure washing wand you are using not a magic wand. If you could wave your wand at the house and make the paint young again you would have waved it at you missus years ago. LOL
 

Dave B

New member
I too would be interested to hear what Craig might have to say. Is F9 safe on these fiber cement sidings? A lot of the homes in my area have this siding, but I certainly don't want to have to repaint because my chemicals damaged the paint.
 

Doug Rucker

Roundtable Host 2009
Looks like two different paints starting at the bottom of the lower windows. F9 the rust, then wet the siding, the wash house, then re rinse. Point out paint issues before starting job.


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I was thinking that or different colored siding...
 

Craig

Member
F9 works great on this type of substrate. Normally go 2:1 or 1:1 if you need it a little stronger. Rinse off before it dries and you're good to go.


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Casey Anderson

New member
Thanks for all of the input guys! I talked to the customer about what to expect and not to expect. He was very understanding. I sent the estimate off so I will report back if we get the job. If we end up doing it, we will try a small test area on the rust first to make sure the finish does not come off.
 

PressureBrothers

New member
Why didn't you do a small test area before you sent in the estimate? This not only sets the expectations visually... It also tells you how difficult or simple it will be to achieve the finished result, and what to price.
 

814jeffw

Active member
Why didn't you do a small test area before you sent in the estimate? This not only sets the expectations visually... It also tells you how difficult or simple it will be to achieve the finished result, and what to price.


Yes...test areas are normal on anything of uncertainty.

Jeff
 
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