Hmmm. wild ideas time-
Probably can't use metal detectors if there is rebar in slab.
Could use sens mic to listen for water flow.
Or...(I like this one best), use a welder transformer to
induce large current in piping and use a 60~ pickup coil
to trace the path of the hum. (At your own risk...)
You better map out the route of the drains too...
Never done it, but you should be able to locate them through infrared
temperature sensing. Run the hot water until it's piping hot and then
start looking for the warm line in the slab. You may have to pull up
some carpet, but, again, theoretically it should pick up the heat
difference even through the carpet. The line won't be as sharp, but
since you want to stay well away from the water lines anyway, that
shouldn't be a problem. The cold water line should run parallel to the
hot water line - I've never seen it done any other way.
If you have a post-tensioned slab, I'd be more worried about hitting a
tensioning strand than a water line.
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