On another forum a member who writes articles mentioned he used 3/8" and should of know better the minimum should be 1/2" as 3/8" will warp I use 3/4 I guess if you would do criss cross 3/8" and screw it down very often you would be okay. I would go with at least 1/2" if not 3/4" thou it's better now than later if you should have a problem and if your already seeing warping I would say it's time to go thicker now.
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