When temperatures drop and winter tightens its grip, one of the most costly surprises a homeowner can face is a burst pipe. Frozen pipes are not just an inconvenience — they can cause serious water damage, disrupt your water supply, and leave you with an unexpected repair bill.
Here in Northern Virginia, the cold usually arrives in short, sharp snaps rather than a long steady freeze, which is exactly the pattern that catches homeowners off guard. The good news is that most frozen pipe situations are preventable. A little preparation before the cold weather hits can save you a significant amount of money and stress.
Why Pipes Freeze in the First Place
Water expands as it turns to ice. When that happens inside a pipe, the pressure builds up fast. Pipes located in vulnerable spots — like a basement, attic, kitchen exterior wall, or near an uninsulated crawl space — are especially at risk.
Both plastic and copper pipes can freeze when temperatures plunge, and there is not enough heat around them. Even a small drop in thermal protection can be enough to trigger freezing overnight.
Steps to Prevent Frozen Pipes Before Cold Weather Arrives
Insulate Pipes in High-Risk Areas
Pipe insulation is your first line of defense. Wrapping exposed pipes in areas like the basement, attic, and near exterior walls helps maintain the temperature of the water flowing through them.
Foam pipe insulation sleeves are inexpensive and widely available. Building insulation around these areas adds another layer of protection that can make a meaningful difference on the coldest nights.
Keep Your Thermostat Set Consistently
One of the most common mistakes homeowners make is turning the thermostat down too low at night or while away. Your heating system plays a direct role in protecting your plumbing, even if that connection is not always obvious.
Keep your thermostat set to at least 55 degrees Fahrenheit, even when you are away for the weekend. Consistent heat circulation throughout your home is one of the simplest ways to keep pipes from freezing.
That only works if your system can keep up. A furnace that short-cycles, a heat pump that struggles below freezing, or a system that hasn’t had an annual heating check in a few years can leave parts of your home colder than the thermostat suggests, especially rooms over a garage or along exterior walls. It’s one of several common winter HVAC problems that only show up once the temperature really drops.
Let Faucets Drip During Extreme Cold
When a deep freeze is in the forecast, let your sink faucets — especially those on exterior walls — drip slightly overnight. A slow, steady drip keeps water moving through the pipes, which reduces the risk of ice forming.
This is especially worth doing for faucets in the kitchen and bathrooms that are on outside-facing walls. It is a small step that costs very little and can prevent a much larger problem.
Disconnect and Drain Outdoor Hoses
Before the first cold snap, disconnect any garden hoses from outdoor spigots. Water left sitting in a hose can freeze and send that pressure back into the valve and into your home’s water supply lines.
Shut off the valve supplying water to outdoor hose bibs if you have that option. This simple winterization step is easy to overlook and easy to do.
Check for Gaps and Air Leaks Near Pipes
Cold air sneaking in through gaps in your walls, foundation, or around windows can rapidly lower the temperature around your pipes. Walk your home’s perimeter and seal any visible gaps with caulk or spray foam.
Pay close attention to areas where pipes pass through exterior walls. Even a small gap can allow enough freezing air in to cause a problem when temperatures really drop.
Know Where Your Main Water Shut-Off Valve Is
This one is not about prevention — it is about damage control. If a pipe does freeze and burst, knowing where your main water shut-off valve is located can prevent thousands of dollars in water damage.
Find it now, before you need it. Make sure everyone in your household knows where it is and how to use it.
What NOT to Do If a Pipe Freezes
If you do end up with a frozen pipe, resist the urge to use a blowtorch, open flame, or kerosene heater to thaw it. These methods are extremely dangerous and are a serious fire risk near wood framing and insulation.
Safer options include a hair dryer, heating pad, or space heater placed at a safe distance. Never leave electric heating equipment unattended, and always work from the tap back toward the wall to release pressure gradually.
FAQs About Frozen Pipes
At what temperature do pipes freeze?
Pipes are generally at risk when outdoor temperatures stay below about 20 degrees for several hours. Poorly insulated pipes in an attic, crawl space, or exterior wall can freeze sooner.
How low can I set the thermostat when I’m away?
No lower than 55 degrees, even for a weekend trip. The savings from setting it lower are not worth the risk.
Should I open cabinet doors under my sinks?
Yes, during a hard freeze. It lets warm room air reach pipes running along exterior walls.
What should I do if no water comes out of a faucet?
You likely have a frozen pipe. Leave the faucet open, locate your main shut-off valve, and thaw the pipe slowly with a hair dryer or space heater at a safe distance. Never use an open flame.
Stay Ahead of Frozen Pipes This Winter
Frozen pipes are one of winter’s most preventable problems, and a little preparation goes a long way. Insulating exposed pipes and sealing drafts help, but steady heat throughout the house is what keeps them from freezing in the first place.
If your system has been short cycling, struggling on cold nights, or hasn’t been serviced going into winter, now is the time to have it looked at. Call Twin Air at 703-754-1062 to schedule heating service or ask about a maintenance plan.