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Re: SOG foundations

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I was actually thinking about concrete SOG foundations, specifically P-T foundations on expansive soils. 
 
The "literature" often recommends the top of slab elevation be 6 or 8 inches above the final grade, but what I have seen in the field is more on the order of the 2 to 3 inches.
 
It seems like this information would have to be on the site plans.
 
Gail Kelley