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Post-Tension Cable placement & site preparation

Post-Tension Cable placement & site preparation

Post-Tension Cable placement & site preparation

(OP)
Our Post-tension foundation has cables that range from one  inch in depth in the 4"slab, to over 5 inches.  Some of the cables that are 5 " are not in beams.  One cable was never stressed and ranges from less than 2" to over 5".  The soil is virgin, expansive, and did not have the required 4 inches of sand compacted before moisture barrier and concrete pour.  The moisture barrier was not layered, but rather just butted together, the duct tape came apart according to one core sample.  We have differential settlement in the structure.
Is this unusual in foundation construction, or is this normal construction standard, as the builder's Geotechnical Engineer claims.
 

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