The short answer
Common Freeze Spots
The most frequent freeze locations are pipes running through unheated areas. Attics, basements, garages, and crawl spaces often lack adequate warmth, leaving water lines vulnerable. Even a small gap in insulation or a cracked window can let cold air reach the pipe surface.
Exterior wall pipes also suffer because they sit close to the outside cold. In regions with wet winters and dry summers, temperatures can dip below freezing, especially at night. Check these areas first if you suspect a problem.
- Attics and crawl spaces with little to no heat
- Garages where doors stay open or uninsulated
- Exterior walls with missing or thin insulation
- Pipes near vents, windows, or dryer exhausts
- Unheated basements or utility rooms
Why Insulation Matters
Insulation slows heat loss, but it does not add heat. If a pipe is already cold, insulation only delays freezing, not prevent it entirely. Properly fitted foam or fiberglass sleeves help, but they must cover every joint and bend.
Sealing air leaks is just as important as adding insulation. Caulk gaps around pipe entries, close vents in winter, and repair broken windows. Cold drafts can overwhelm even good insulation, so combine both strategies for the right protection.
The Drip Trick
Letting a faucet drip during a hard freeze keeps water moving, which makes freezing less likely. Moving water is harder to freeze than still water, and the drip relieves pressure that can build up. A slow trickle is enough; you do not need a full stream.
Open the cabinet doors under sinks to let warm room air reach the pipes. This simple step works well for kitchen and bathroom fixtures. If you plan to be away, set the thermostat no lower than 55F, even if that costs a bit more.
When Freezing Happens
If a pipe freezes, shut off the main water valve immediately to prevent pressure buildup. Then open the faucet nearest the frozen section to allow water to escape as it thaws. Use a hair dryer, space heater, or warm towels to gently warm the pipe.
Never use an open flame, such as a blowtorch, to thaw a pipe. Rapid heating can crack the pipe or cause steam to burst. If you cannot locate the frozen spot or the pipe has already burst, turn off the water and call a plumber.
Dealing with Burst Pipes
A burst pipe releases a large amount of water quickly, soaking walls, floors, and belongings. The longer water sits, the more damage it causes, so act fast. Shut off the water main and electricity in the affected area if safe to do so.
Remove standing water and begin drying the space with fans and dehumidifiers. If the water spread into walls or flooring, you may need professional help. Local water damage pros can handle extraction and drying. See the related pages for more guidance.
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Call Now (425) 407-5186Frequently asked questions
At what temperature do pipes freeze?
Pipes can freeze when the air around them drops below 32F. However, the actual freezing point depends on factors like insulation, air movement, and how long the cold lasts. A sustained dip into the 20s often triggers freezing in exposed pipes.
Should I let all faucets drip?
No, focus on faucets connected to exposed pipes, especially those in unheated spaces. Letting every faucet drip wastes water and is unnecessary. Choose the ones farthest from the main supply line, as they have the longest exposure to cold.
What should I do if a pipe bursts?
Shut off the main water valve right away to stop the flow. Then turn off electricity in the flooded area if safe. Remove valuables and start drying with towels, fans, and a dehumidifier. For extensive water damage, contact local water damage pros for help.