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Old 09-05-2014, 04:00 PM   #1
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Houston We Have A Problem

Ok so call me senile or lets just say my once photographic memory is out of film. Anyway, of all my reading on here, I never caught the part about not using treated plywood for a subfloor due to corrosion with aluminum.

Yes, I did it. Installed the last 2 feet in my batroom due to rot with treated. The good news is everything is still out so replacement though still a pain will be relatively easy. Of course everything is bolted up.

Anyway, just want to confirm that yes I did dump in my Wally Byam beanie and need to replace asap.

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Old 09-05-2014, 05:19 PM   #2
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You would have to take a look at the specifics of the chemicals used to treat the wood you used. There are many different types and classifications of treating these days.
I don't ever use treated wood in sub-floor replacement, but that isn't to say it is wrong.


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Old 09-05-2014, 05:51 PM   #3
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If you coat the wood with something like polyurethane it may not be an issue. Also if you put an strip of thin plastic between the floor and the aluminum and the floor and the frame, you will probably be fine. If the wood stays dry it does not cause corrosion. Fasteners need to be stainless steel.

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Old 09-05-2014, 06:25 PM   #4
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This is a pretty good site to peruse, if you're concerned with using treated wood: Treated Wood Products
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Old 09-05-2014, 06:33 PM   #5
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I think the problem may be more related to exposure to the treated wood chemicals in a small, enclosed space than it is to chemical reaction with aluminum. Of course, if you can fix the leak, and eliminate the moisture, it wouldn't matter what you use. But then, if that were easy, none of us would be having these issues.
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Old 09-05-2014, 06:37 PM   #6
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I had to use pressure treated plywood several years ago in our trailer's bathroom area. It wasn't my first or second choice, but it did get the job done. So far, it has caused no trouble. Sometimes you get lucky, and I'd rather be lucky than good.
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Old 09-05-2014, 08:10 PM   #7
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Thanks for the replies guys. Ill look into it a bit further. I guess the sure thing is to replace with untreated on the other hand if its a 50 year issue then what the hell. Bottom line is I don't want to be replacing panels and c channel a few year from now cause i didn't take the step of pulling what I now know was wrong.Im not a perfectionist per se but not into knowingly being an idiot.
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Old 09-05-2014, 09:57 PM   #8
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I think if I were in your position I would just pretend that I never even saw treated plywood, and I would just finish the build.
The fact that I am opinionated does not presuppose that I am wrong......

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Old 09-05-2014, 10:03 PM   #9
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The problem occurs when you use treated wood which has been treated with copper based wood preservatives. When copper comes into contact with aluminum, it tends to make a battery. Non copper based wood treatments work fine. I have used Olympic Stain's wood preservative to preserve the OEM plywood floor and works perfectly. Doesn't show any additional aging after 10 years.

So Long!
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