Key freeze prevention measures: all supply pipes in exterior wall cavities should be on the warm (interior) side of the insulation; crawl space supply lines need insulation or the crawl space needs to be encapsulated and conditioned; hose bibs should be frost-free or have interior shutoffs that can be drained in winter; and unheated garages should not have supply lines running through them without freeze protection. PEX-A is significantly more freeze-resistant than copper — it expands under freezing pressure rather than splitting. RainFire Builders routes supply lines on the interior insulation face in exterior walls and installs frost-free hose bibs at all exterior locations as standard practice.