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None of my risers are IN the ground and do "float" on the surface. Frost depth in our part of Minnesota is 42" and to provide space for gravel in the bottom of the hole I would need to dig down a full 4 feet. This would be a LOT of WORK. I reasond that if track at ground level could "float" in a bed of gravel that same track could "float" on risers that were sitting on a bed of gravel. IT WORKS!!! Not only does the elevated track "float" so do our cement mountains. I have found that setting posts below frost level is a lot of unnecessary work and will not do so ever again; unless i'm building a fence or pole barn. I have also found that 4x4s are over kill and use 2x4s or 2x6s for my risers. Placing "feet" on the bottom of each riser will prevent your risers from sinking into the ground much like snow shoes prevent a person from sinking into the snow. If your risers are quite high some lateral bracing may be needed in a few places. OLD DAD
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