How To Prevent
Pipes From
Freezing This Winter

Why the Mid-Atlantic Has a Pipe Freeze Problem

The Mid-Atlantic's climate creates a specific and dangerous condition for residential plumbing: not sustained deep cold, but repeated cycling across the freezing threshold. A home in Minnesota may see temperatures stay below zero for weeks — pipes either freeze early or are protected well enough to survive. A York County home sees temperatures drop to 15°F overnight and rise to 38°F the following afternoon, then drop again — repeatedly, for weeks at a time between November and March.

This cycling creates stress in ways that sustained cold does not. Each freeze cycle builds pressure inside pipes as water expands. Each thaw releases that pressure — sometimes through a split in the pipe that wasn't there before the freeze. A pipe that survives fifty freeze-thaw cycles may fail on the fifty-first. The unpredictability is what makes winter pipe failures so devastating — they often occur not during the coldest night of the year but during an ordinary cold snap that seemed no different from the fifty that preceded it.

The older housing stock throughout York County compounds this. Homes built before 1970 were constructed before modern insulation codes and pipe protection requirements. Pipes routinely ran through exterior wall cavities with minimal insulation behind them, through unheated crawlspaces without any protection, and through attached garages and outbuildings with no freeze protection at all. These locations are where virtually every burst pipe call in York County originates.

The Highest-Risk Locations in Your Home

Not all pipes face equal freeze risk. Focus your prevention efforts on these locations first:

• Pipes in exterior walls — particularly on the north and west faces of the house where wind chill is most severe. Kitchen and bathroom supply lines running through exterior walls are the single most common source of burst pipe calls.
• Crawlspace plumbing — any pipes running through unheated crawlspaces are exposed to outdoor temperatures when the crawlspace is not properly insulated and vented.
• Attached garage plumbing — supply lines to utility sinks, outdoor spigots, and any plumbing passing through garage walls are unheated and vulnerable.
• Attic plumbing — less common but found in some older York County homes. Pipes in uninsulated attic spaces can freeze even when the rest of the house is warm.
• Outdoor hose bibs — the spigots on the exterior of the house. These must be winterized every fall without exception.
• Pipes near uninsulated foundation — supply lines running along interior basement walls near the foundation in older homes are more vulnerable than they appear.

Prevention Steps — In Order of Priority

1. Insulate Pipe in Vulnerable Locations

Foam pipe insulation sleeves are inexpensive, available at any hardware store, and take minutes to install on accessible pipes. For pipes in crawlspaces and basements, this is the single most cost-effective freeze prevention measure available. Insulation does not heat the pipe — it slows the rate at which the pipe loses heat to the surrounding cold air, buying time before the pipe temperature drops to freezing.

For pipes in exterior walls that are not accessible without opening the wall, adding insulation to the wall cavity from the outside or inside during any renovation or repair project is the permanent solution. In the interim, keeping cabinet doors under sinks on exterior walls open during cold snaps allows warm interior air to circulate around the supply lines.

2. Disconnect and Drain Outdoor Hose Bibs

Every fall before the first hard freeze, disconnect all garden hoses from outdoor spigots. A hose left connected traps water in the spigot and supply line, preventing drainage. Modern frost-free hose bibs are designed to drain automatically when the hose is disconnected — but they can only drain if no hose is attached. Disconnect all hoses before November. If your home has older non-frost-free hose bibs, shut off the interior valve feeding them and open the exterior spigot to drain the line.

3. Maintain Minimum Heat When Away

The most common scenario for catastrophic pipe burst damage is the homeowner who turns the heat down to 55°F or lower when leaving for an extended winter trip. The thermostat may maintain the interior air temperature — but the interior air temperature is not the same as the temperature inside an exterior wall cavity. A 55°F interior with outdoor temperatures in the single digits can produce pipe temperatures below freezing in uninsulated exterior walls.

The recommended minimum thermostat setting when away from home in winter is 60°F for homes with normal insulation, and 65°F for older homes with inadequate wall insulation. The cost difference in heating bills is negligible compared to a single burst pipe event.

4. Know Where Your Main Shutoff Is

Prevention is not always possible. The second line of defense is being able to stop the damage within seconds of a pipe failing. Know exactly where your main water shutoff is — in most York County homes, it is in the basement near the front foundation wall. Test it at least once a year to confirm it operates freely. A stuck valve in a burst pipe emergency is a catastrophe.

5. Let Faucets Drip During Extreme Cold Snaps

When temperatures are forecast to drop below 15°F — which happens several times each York County winter — allow faucets served by pipes in exterior walls to drip at a very slow rate overnight. Moving water is significantly more resistant to freezing than standing water. This is a short-term measure for extreme cold events, not a substitute for proper insulation.

6. Consider Pipe Freeze Alarms for High-Risk Areas

Inexpensive temperature sensors connected to your smartphone — available for $20-50 — can alert you when temperatures in a crawlspace or garage drop to dangerous levels, giving you time to take action before pipes freeze. For York County homeowners who travel frequently in winter or have known vulnerable pipe locations, these sensors are inexpensive insurance against a very expensive event.

If You Return Home to a Frozen Pipe

A frozen pipe that has not yet burst is a genuine opportunity to prevent the damage rather than just respond to it. Signs of a frozen pipe: a faucet produces no water or a trickle, there is a bulge or frost visible on an exposed pipe section, or there is an unusual smell from a drain indicating frozen trap water.

Do not attempt to thaw a pipe with an open flame, a heat gun at high setting, or any localized high-heat source. The sudden temperature differential can cause the pipe to burst. Use a hair dryer on low heat, heat tape, or warm towels applied slowly along the length of the pipe starting from the faucet end and working toward the frozen section. Keep the faucet open so steam and water can escape as the ice melts.

If you cannot locate the frozen section, or if you are not certain whether the pipe has already split, turn off the main water supply before attempting any thawing. A pipe that has already split will release full water pressure the moment the ice blockage melts.

When Prevention Fails

Despite every precaution, burst pipes happen. York County's winter weather is unpredictable and older housing stock carries risk that no amount of preparation fully eliminates. When a pipe does burst, the response in the first thirty minutes determines the scope of damage. Shut off the main water supply, cut power to affected areas, document everything with photographs and video, and call a restoration contractor immediately. The 48-hour window before mold becomes a serious risk means there is no time to wait and see.