Join Date: Jun 2007
Location: Grapevine TX
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Your some what limited in what you can prove or disprove now. If you bought American graded plywood then it could be C grade innner ply's for all you know. We don't grade then innner layers. The British system rates all layers but it uses a numeric system. You most likly bought either A/C grade or A/B grade. Add in that the football patches that are on the B or C grades aren't usually glued on the edges very well. And marine grade used to only cover fir plywood but southern yellow pine is also sould as marine plywood by a lot of lumber yards these days. Do however remember that there is a big difference between A grade and B grade veneers and that alone makes for a big difference in price.
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