[powerslide]

Don-Wow, the structural specs on that garage floor are awesome! The presence of a vapor barrier under the concrete floor cannot be over emphasized, especially in areas that have soils with a high plasticity index. You can follow all the correct manufacturers instructions, and use the best materials, but the lack of an approved vapor barrier can ruin everything. The moisture will just percolate right up through the concrete and the hydrostatic pressure will eventually lift the best of finishes. Having an approved vapor barrier is just as important as correct surface preparation.