Why mild-winter towns get caught out
It sounds backward, but a mild climate is part of why pipes burst here. Chapel Hill winters are gentle enough that homeowners do not think about freeze protection, and the housing is not built for hard cold the way northern homes are. So when a real cold snap arrives, and it does most winters, unprotected lines in the coldest parts of the house freeze, expand and split. The region has seen the extreme version in the December 2002 ice storm, when much of the Triangle lost power for up to ten days and cold houses had pipes freeze and burst when the heat came back.
The good news is that the vulnerability is predictable, which means it is preventable. A burst pipe is not random; it happens in specific, known spots, and a little attention to those spots in the fall dramatically lowers the odds of a flooded house in January. A burst under a crawl space can run for hours before anyone notices, turning a pipe repair into a water damage job as well, which is exactly the outcome prep avoids.
Before-winter freeze-proofing checklist
- Insulate pipes in the crawl space, along exterior walls and in the garage.
- Swap old hose bibs for frost-proof ones; disconnect and drain garden hoses.
- Find and label your main water shutoff before you ever need it.
- During a hard freeze, let a thin trickle run from the furthest faucet.
- Open cabinet doors under exterior-wall sinks so heat reaches the pipes.
- Keep the house heated even when you are away.
The spots that actually freeze
Freezing follows the cold, so the vulnerable pipes are the ones in the least-heated, least-protected parts of the house. In Chapel Hill that means lines in vented crawl spaces, pipes running along uninsulated exterior walls, anything in an unheated garage, and the outdoor hose bibs. Those are the runs that sit closest to outside temperatures with the least warmth around them, and they are where the splits happen.
Knowing the list is half the battle, because it tells you exactly where to focus. Insulating those specific runs, wrapping or foam-sleeving the exposed crawl-space and exterior-wall pipes, and swapping an old hose bib for a frost-proof one addresses the majority of the risk for very little money. It is far cheaper than the emergency repair and cleanup that a burst in one of those spots causes.
Before and during a cold snap
Fall prep is the durable fix: insulate the vulnerable runs, add a frost-proof outdoor faucet, disconnect and drain garden hoses so water does not sit in the bib, and make sure you know where your main shutoff is, because if a pipe does burst, shutting the water off fast is what keeps a leak from becoming a flood. Doing this once, before the first freeze, covers you all winter.
When a hard freeze is actually forecast, a few simple moves genuinely work. Let a thin trickle run from the faucet furthest from where the water enters, since moving water is far harder to freeze. Open the cabinet doors under sinks on exterior walls so household heat reaches the pipes. Keep the house heated even if you are away. These are not old wives' tales; they are what plumbers actually recommend, and they cost nothing.
If it keeps happening in the same spot
Some homes freeze in the same place every single winter, no matter how carefully you wrap and trickle. When that is the pattern, the real fix is not repairing the same pipe each January, it is rerouting that vulnerable run out of the cold zone, or, if the whole supply system is aging galvanized that is failing generally, planning a repipe that moves the lines away from exterior walls and unheated crawl spaces at the same time.
That turns a recurring winter emergency into a solved problem. A repipe or reroute is a bigger job than wrapping a pipe, but for a house that has flooded or nearly flooded more than once, it is the honest, permanent answer rather than an annual gamble. We would rather plan that for the spring than keep meeting you for the same burst pipe every cold snap, and we will tell you plainly when a home has crossed from "prep it" into "reroute it."
It is also worth keeping a small freeze kit on hand before winter: pipe insulation sleeves, a cover for each outdoor hose bib, and the knowledge of where your main shutoff is and which way it turns. None of it is expensive, and having it ready in the fall means you are not shopping for insulation the night a hard freeze is forecast. The households that come through a cold snap without a burst are almost always the ones that did fifteen minutes of preparation in November rather than none.
If you travel in winter, set the thermostat no lower than the mid-fifties rather than turning the heat off entirely, and have someone check the house during a hard freeze. A vacant, unheated house is where the worst freeze bursts happen, because no one is there to notice the trickle or shut the water off, so a small split runs for days. Leaving the heat on low and the water either monitored or shut off at the main is cheap insurance against coming home to a soaked house.
Questions we get
Yes, most winters see at least a few hard freezes, and because homes here are not built for hard cold and owners rarely prepare, those few nights do outsized damage to exposed pipes. The 2002 ice storm was the extreme example.
The exposed ones: lines in vented crawl spaces, along uninsulated exterior walls, in unheated garages, and outdoor hose bibs. Those sit closest to outside temperatures with the least warmth around them, so they are where splits happen.
Yes. A thin trickle from the faucet furthest from where water enters keeps water moving, and moving water is much harder to freeze. Combined with opening cabinet doors under exterior-wall sinks, it is a genuinely effective cold-snap move.
Shut off the main water valve to stop the flood, then open a couple of faucets to relieve pressure, and call. If you cannot find your main shutoff, stay on the line and we will walk you to it. Stopping the water is the most important step.
That pattern means the fix is rerouting that run out of the cold zone, or repiping if the whole supply is aging, rather than repairing the same pipe each winter. For a home that keeps freezing, that is the permanent answer.
Worried about the next cold snap?
We will freeze-proof the vulnerable runs now, or reroute a pipe that keeps failing.