Classic Daycruiser
#563
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I’m pretty sure most houses built on slabs using copper run through the attic.
In Arizona (Phoenix), most homes built on slab are plumbed underground. My home is 30 years old, and has in ground copper. There was a time when plumbers were re-piping in the attic with copper.
Now most re-piper's use "plastic tubing" of the current preferred vender, and everything is done through the attic and walls.