30+ years ago we had a house on a slab and of course the water lines were in the slab. After a break in the hot water line, insurance wanted to repair the break ( not "replumb"!!)
I told them to forget it, I'll take care of it.
With kitchen/laundry on one end of the house, bathrooms on the other, I ran supply lines in the attic but I housed both in a common (2 1/2"? Can't remember) so that if a break occurred, it would run out in the garage and not anywhere in the attic or main floor level.
Mike