The short answer
How Freezing Water Damages Pipes
Water is unique because it expands as it freezes. This expansion puts immense pressure on the interior walls of a pipe, whether it is made of plastic or metal. The pressure can build until the pipe ruptures, often at a seam or a weak spot. The break may not be discovered until the ice thaws and water begins to flow out.
A small crack from freezing can release hundreds of gallons of water in a single day. This water then flows into your walls, ceilings, and floors, causing extensive water damage. The leak can happen far from the actual break if water runs along pipes or framing. This hidden flow makes the source of the leak difficult to locate without professional inspection.
Common Locations for Frozen Pipes
Pipes are most vulnerable in areas of your home that lack consistent heat. Attics, basements, crawl spaces, and garages are typical trouble spots. Pipes running through exterior walls, especially in kitchens and bathrooms, are also at high risk. Even a small gap in your home's siding or insulation can let in enough cold air to freeze a pipe.
- Pipes in unheated attics or crawl spaces.
- Water supply lines inside exterior walls.
- Outdoor hose bibs and sprinkler supply lines.
- Plumbing in basements, garages, or utility rooms.
- Pipes under kitchen or bathroom sinks on exterior walls.
- Any pipe located near a drafty window or door.
The Role of Temperature and Insulation
Sustained temperatures below 20 degrees Fahrenheit significantly increase the risk of frozen pipes. However, a rapid drop in temperature overnight can also cause problems, even if the daytime temperature is higher. Wind chill plays a major role, as it can cool pipes much faster than still air. A strong wind driving against an exterior wall can freeze a pipe in just a few hours.
Proper insulation is your first line of defense. Pipe insulation sleeves are an affordable and effective solution for exposed pipes. For pipes inside walls, ensuring your home's wall insulation is adequate is crucial. Sealing cracks and openings where cold air can enter, especially around pipe entries, helps protect vulnerable plumbing from frigid drafts.
Preventing Pipes from Freezing
You can take several proactive steps to protect your plumbing. Letting a trickle of cold water run from faucets connected to vulnerable pipes keeps water moving, making it harder to freeze. Maintaining a consistent thermostat setting day and night, even when you are away, is critical. A small increase in your heating bill is far less costly than repairing water damage from a burst pipe.
Drain and disconnect outdoor hoses before winter. If you have an indoor shutoff valve for outdoor faucets, turn it off and drain the line. Consider installing insulated faucet covers on all exterior hose bibs. For longer absences in cold weather, you may choose to drain your home's water system entirely, but consult a plumber for proper procedure.
What to Do If a Pipe Freezes
A faucet with only a trickle of water may indicate a frozen pipe. Keep that faucet open, as flowing water can help melt ice within the pipe. You can try to thaw the pipe gently with a hairdryer or heating pad, starting from the faucet end and working back. Never use an open flame or a propane torch, as this is a fire hazard and can damage the pipe.
If you cannot locate the freeze, if the pipe has already burst, or if thawing does not work, you need to act. Shut off the main water supply to your home immediately to prevent flooding. Then, you should contact a local water damage pro and a plumber. The pros can handle the water removal and drying, while the plumber repairs the broken pipe.
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Call Now (240) 261-5117Frequently asked questions
At what temperature do pipes usually freeze?
Pipes are at risk of freezing when surrounding air temperatures remain at or below 20 degrees Fahrenheit. However, pipes in uninsulated exterior walls or crawl spaces can freeze at higher temperatures during prolonged cold snaps, especially with significant wind chill.
What should I do if a pipe bursts in my home?
Immediately turn off the main water supply to stop the flow. Then, call a local water damage pro for emergency water extraction and drying to prevent mold and structural damage. You will also need a plumber to repair the broken pipe itself.
Does homeowners insurance cover damage from burst pipes?
Many standard policies cover sudden, accidental water discharge from a burst pipe, but not damage from a lack of maintenance. You are typically responsible for repairing the broken pipe. Policies vary, and your insurer decides what is covered.
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