Re the copper pipe leaks. One of the problems may be that the copper product is inferior. I have inspected several defective projects that had the same pinhole leaks and these lines were placed in the overhead. In this are, Souther Califonia, we've had tracts that had [perforated gas lines using black pipe - to be expected.
Is the copper burried in a sand layer or could it be touching the screed buried in the cement?
In all the years the UFER has been in use it does not seem to have affected the copper. Eric David
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