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The cement sheet on top of the plywood is a good idea, but I would have added a thin metallic sheet on top of that to spread the initial heat over a larger surface. I'm not sure what you are trying to accomplish here though.

"Lifetime Limited Warranty" on the plywood. Had to laugh about that. Your lifetime, or its lifetime? When it's kaput the warranty is over? If that's the case, what's the "Limited" all about? So many questions, so few answers.

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