Dave, you read right. The upper level is 1/2" plywood and 1/2" ceiling tile, supported on the perimeter and a couple places in the middle. I have a 2' by 2' access hole near one end. I use Fastrack, so the clearance is even less. The forms were left over from a new milking parlor in 2008, so the price was "just right". Works for me, as the cars just have to clear the plywood and not any framing. 3/4" plywood will be even better for strength.
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