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The time has come to replace the 13 y/o plywood on my sled deck. I'm amazed it lasted this long. the thickness of the plywood is what I'm not sure of. when I measure it, I'm only seeing about 1/2 inch, but this is after years of rot, and cant be right. whenever I see new trailers for sale, they advertise "5/8 marine grade plywood" I'm guessing that's probably what I need. so, if anyone out there has experience replacing the wood on a sky hi deck, please chime in. 
