Austin cold snaps catch lightly protected plumbing off guard.
Hard freezes are not the usual day-to-day condition in Austin, so some plumbing is left exposed or only lightly protected. When severe cold arrives, water inside a vulnerable pipe freezes and blocks the line. The ice takes up more space as it forms, putting pressure on the pipe and its connections.
The runs most often affected are those in exterior walls, garages, unconditioned attics, crawl areas, and outdoor plumbing connections. These locations lose heat faster than the conditioned parts of the house, particularly when they were not arranged for long periods below freezing.
Thawing restores flow, but that is not the end of the check. A pipe can split while frozen and show no leak until the ice melts and pressure returns. Once the line is thawed, we look for leaks or damage on the affected run. For future Austin freezes, the useful protection is targeted: insulation and air sealing where the vulnerable pipe passes through an exposed area, protection for outdoor piping, and shutoff access where it is practical.