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Old 01-09-2007, 01:16 PM   #1
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pressure treated ply -- not against aluminum!

This might be the second post but here goes. I own 8 sheets of pressure treated plywood. Now that I have read all the stuff here I got to looking at the tags that come stapled to every sheet and in the small print it says not to be in contact with aluminum and I got to thinking that is a real big possibility in this little project. I am sure glad I did some reading here first. Thanks Dave
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Old 01-09-2007, 01:42 PM   #2
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Dave,

Bad news, but at least you caught it before you screwed it down.

Do you have someplace else you can use the green stuff?
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Old 01-09-2007, 01:48 PM   #3
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green stuff

Boy that sounds like something bad. I just retired from being a carpenter for 30 years so I have lots of places to use it. I worked with pressure treated wood some a I do not walk around talking to myself to much. I just never used around alum.
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Old 01-09-2007, 03:37 PM   #4
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I'm assuming you're talking about using it on the floor? If so, what about using something between the wood and whatever you are going to fasten it to? Roofing felt perhaps?
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Old 01-09-2007, 04:28 PM   #5
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Boy I guess I could have said floor. But I guess I was just thinking floor. I probably could but all the the rest of the things I read make it sound like a bad idea. But thanks for the thought.
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Old 01-09-2007, 06:10 PM   #6
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Cheaper to use it some place else on another project, than to have something bad occur because of an accidental contact with aluminum.
Does anyone know what the reaction is? Is it a structural issue or a health issue? Some chemical reactions are not worth playing around with.
Dave
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Old 01-09-2007, 06:27 PM   #7
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The main problem is corrosion due to the emf of chromated copper against aluminum. I've also heard some people express concern about living on a floor treated with arsenic, but I don't think that is a problem if it is sealed under tile or vinyl.
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Old 01-21-2007, 05:11 PM   #8
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Most all pressure treated wood for residential use is now ACQ. ACQ is very corrosive on all metals except stainless steel.
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Old 01-21-2007, 06:16 PM   #9
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Pressure treated warping

I don't know about ply but regular pressure treated lumber tends to warp more than untreated.
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Old 01-21-2007, 06:49 PM   #10
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I've used fire rated ply (surplus) on different projetcs, but not my AS. Thing is, even pieces I badly neglected, leaft in the weather for a very long time, seems to hold up remarkibly well. Not pressure treated but apparantly uses an epoxy glue. Never say any warning tags on it either. Eats saw blades, but once cut with a well lubricated say it is tuff. I wonder how it would do?
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Old 01-22-2007, 05:53 AM   #11
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Arrow Pressure treated plywood.

Quote:
Originally Posted by geezernbabe
This might be the second post but here goes. I own 8 sheets of pressure treated plywood. Now that I have read all the stuff here I got to looking at the tags that come stapled to every sheet and in the small print it says not to be in contact with aluminum and I got to thinking that is a real big possibility in this little project. I am sure glad I did some reading here first. Thanks Dave
Hi Dave; We have in the past tried to use it in aluminum boats as flooring. Bad news. First of all, it did de-laminate and surface cracked as it dried in hot sun leaving us a great mess to re-do. That process of drying oxidized the aluminum surface as well. To top it all, using it on the floor in confined space such as your RV it is something I would not think of doing.
I do not believe that is possible to make it air tight.
This stuff is treated against rotting but not de-laminating and cracking.
I just finished a new SS frame and new floor. I have used Omega Panel board. It is 1/2" thick, and both sides are laminated with 0.025" aluminum sheet, making it into a very stiff 4x8' panel. Cut edges were heavily flooded with Git Rot and trimmed with 1/2" C channel, sealed with 3M 5200 adhesive. My intention was to do it once and forever. Cost of labor is many times greater than the difference in material costs. Thanks, "boatdoc"
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Old 01-22-2007, 08:19 AM   #12
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Yuk!

Greetings Dave!

Yes, pressure treated ply is a cancer for AS. Stick to 5/8" marine ply. Another problem I have heard of with PT ply is that is never really dried when shipped to the yards hence the shrinking, delaminating etc. As with ALL PT lumber as I am sure you know always were a mask! Pretty yukky stuff to be breathing in.
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Old 01-31-2007, 07:22 AM   #13
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Marine Ply vs Exterior Ply

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Greetings Dave!

Yes, pressure treated ply is a cancer for AS. Stick to 5/8" marine ply. Another problem I have heard of with PT ply is that is never really dried when shipped to the yards hence the shrinking, delaminating etc. As with ALL PT lumber as I am sure you know always were a mask! Pretty yukky stuff to be breathing in.
Hi rickandsandi; I thought that I should just mention the differences between Marine and Grade A exterior plywood.
Glue used in exterior ply is the same as one used in Marine ply.
Marine ply is mostly Luan veneer filled with Mahogany or Luan outer. Major difference is in the quality of veneer. Marine ply has no voids or cracks in fill veneer, exterior plywood does to some degree. Grade A exterior is usually one side sanded and has no patch work on the clean sanded side. While it is difficult to find a good grade of exterior, few company's produce it, where voids inside are almost non existent. Use of Marine plywood as floor in AS is almost cost prohibitive vs Grade A exterior which is half the price. The most important issue with floor is sealing it from moisture which will rot marine plywood as quickly as exterior. PC- Products has on the market a wood petrifier in a liquid form which we experimented with. We heated the ply to about 80 degree for 12 hours and soaked the ply with it. Two samples from the same sheet were placed outdoors for four months, one treated one was not. Untreated ply showed serious deterioration while the treated piece looked as the day we left it. While we have no proof of further longevity the stuff worked very well. Perhaps this may be a cheaper choice for floor replacement. Thanks, "Boatdoc"
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Old 01-31-2007, 07:32 AM   #14
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Greetings Boatdoc-

Your comments are right on, but when it comes to my AS projects nothing is too good! The few extra $$$ make for a job done that will last longer than I. While there is often a less expensive way to do things that may work, I would rather put my money into the best whenever possible. Thank you for sharing your input!

Rick
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