Mike: I use 3/4 " particle board on mine. you could use 5/8 or 1/2 if you have enough bracing. I can stand on mine and you know me.. LOL... also the cost is good too. My cost on 3/4 is 19.50 per sheet. I didn't use foam on my layout, the indoor/outdoor green carpet keeps the noise down, good enough for me.
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