Thanks again AC, my Marks is buried deep under construction materials right now.
It will be two years before we pour the floors, so have not bothered to do the math yet. The sand idea was put forth over a few beer on the beach in Mexico, so not to worry.
Am more concerned right now with the asphalt covered styrofoam, if we decide to use it, I need to get it soon, so was hoping for feedback on that.
Or ways to ensure the asphalt oils do not migrate (capillary action) upwards
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