www.tinboats.net has all the info you want and then some. It's a forum board like this one.
I used marine... I've always heard do not use treated lumber where it will come in contact with aluminum... Something about a chemical reaction between the two. I've never tried it but I've seen the pics of what they say happens... Not good.
I just bought some from Interstate plywood in Memphis for $80.sheet. But I used 1/2 treated covered in outdoor carpet on a jonboat that lasted 20 years withhout rotting. FYI
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