Ive got a wood floor in my sled garage. We graded and compacted the sand,layed some well used blue tarps down for a vb,set 2x4 joist at 24" oc and layed 3/4" treated plywood on it,screwed down. Its great,no damage from or to the track studs or carbides,water and mess from the sleds thawing when we come back drains right thru it. Its been down for over 10 yrs now w/o any issues. I even lagged my sled hoist down to it. Lawn maintence equipment is in there too during the summer. I rolled 3,maybe 4 heavy coats of some cheap sealer on it (probably thompsons) when we put it down. Down side is that it doesnt sweep well,we vacume it ,but only 2-3 times a year .