Update from our EMF consultant: The measurement fluctuations on the loop reading were due to drift using an 18 inch loop ammeter to measure a thin conductor at low levels of amperes. When we switched to a more appropriate clamp meter (The Ideal Ammeter), the net current equaled zero. This confirmed that [electrician] and his team successfully identified and fixed the final net current issue and [the builder] can confidently resume his work knowing that the magnetic fields have been remediated.
I have updated my previous post and we are now clear to put up the walls.
Also, I forgot to mention earlier that the team has finally finished the siding, although there is still some touch up painting to be done on the trim. Gutter installation should be starting the week after next. After that, the deck flooring will be installed.

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