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Exterior Contains discussions about the exterior portion of a home inspection. This includes roofs, gutters, downspouts, decks, patios, windows, et cetera.

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  #1  
Old 6/23/09, 10:34 AM
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Default aluminum siding corrosion

has anyone seen blistering on aluminums siding like this? it seems to be localized to the north wall which happens to have dense shrubs. chemical spray treatment possibly? galvanized nails? Any ideas?

Thanks, John
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aluminum-siding-corrosion-img_3465.jpg   aluminum-siding-corrosion-img_3464.jpg  



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  #2  
Old 6/23/09, 11:44 AM
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Default Re: aluminum siding corrosion

Looks like a paint defect more than corrosion. How much was there?



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  #3  
Old 6/23/09, 4:09 PM
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Default Re: aluminum siding corrosion

quite a bit, it looks like what happens to your car from the rust causing the paint to bubble.



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  #4  
Old 6/23/09, 4:12 PM
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Default Re: aluminum siding corrosion

here is another shotaluminum-siding-corrosion-img_3531.jpg



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  #5  
Old 6/23/09, 4:33 PM
Richie Dimmerling Richie Dimmerling is offline
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Default Re: aluminum siding corrosion

I can't really tell from the photo but did it look like it was recently painted (not the orginal factory coating)?



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  #6  
Old 6/25/09, 1:51 PM
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Default Re: aluminum siding corrosion

To me it looks like the owner tried to touch up some spots on the siding and the touch up stuff blistered.



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  #7  
Old 6/25/09, 5:18 PM
Jeffery L. Haynes Jeffery L. Haynes is offline
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Default Re: aluminum siding corrosion

owner probably used latex paint......which will do exactly what is shown in your pictures (because of ammonia in the latex)...............aluminum siding can be painted but it must have a oil based primer first.....other wise one is wasting their time.

regards

Jeff
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  #8  
Old 6/26/09, 2:50 AM
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Default Re: aluminum siding corrosion

If it's a paint issue, it will be a failure of the bond and may feel hollow.
If it's corrosion, popping a little section should show corrosion.

Aluminum doesn't really corrode, but there are similar alloys that will. Are you sure this wasn't a steel-core product coated with aluminum?




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  #9  
Old 6/26/09, 9:08 PM
Larry D. Kage Larry D. Kage is offline
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Default Re: aluminum siding corrosion

Quote:
Originally Posted by kshepard View Post
Aluminum doesn't really corrode, but there are similar alloys that will.
I think you mean it doesn't rust, which is for iron and steel corrosion, but aluminum does corrode. I believe the corrosion is aluminum oxide which protects the aluminum some from further corrosion, as I understand it.



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  #10  
Old 6/26/09, 10:29 PM
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Default Re: aluminum siding corrosion

Aluminum is a high-energy metal, meaning it takes a lot of energy to mine, refine, combine and manufacture it. This also means that it should corrode fairly easily, since high-energy metals naturally break down until they reach their lowest energy state, which is usually an oxide, as you said, Larry. Oxides are the raw materials used to manufacture aluminum and other metals. They're what's taken out of the ground.

I've asked about aluminum corrosion but never really gotten a satisfactory answer. Anyway... I sure would like to know the real answer to this one.




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Last edited by kshepard; 6/26/09 at 10:35 PM..
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