I looked into marine ply and was turned off by the cost being three times what 5/8" exterior grade fir siding goes for. If you have the money it's a good product, and I've never heard of copper chromate in marine ply. Typically it's the same as exterior fir ply, but without any voids, and with the same adhesives as regular exterior ply.
I just coated my flooring with water-based floor finish underneath, and Kilz primer and exterior latex housepaint on the perimeter.
The copper chromate will cause you more problems than it will the aluminum. I would not use it in any space that will be enclosed where people reside, barrier or no.
Rich the viking
Originally Posted by Petethefeet
I too had wondered about using a treated ply or treatment on the ply for flooring. I have read on other threads of owners installing marine grade plywood as a substitute. Marine ply here has high levels of Copper Chromate.Personally for me, I would be concerned about the Copper component ( or any element for that matter ), reacting with the Aluminium when in contact. I suppose an inert barrier could be implemented. Would be interested in others opinion on that one,