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A single burst pipe can release 250 gallons of water per day. Learn how to prevent frozen pipes this winter with simple, low-cost steps like pipe insulation, heat tape, and sealing air leaks before temperatures drop.
Or call (303) 555-0179Frozen pipes burst when water expands inside them - and a single burst pipe can release 250 gallons of water per day, causing thousands of dollars in structural damage. The good news: preventing frozen pipes costs almost nothing if you act before temperatures drop.
Pipes freeze when the surrounding air temperature falls to 20°F (-6°C) or below for a sustained period. Pipes in unheated spaces - crawl spaces, attics, garages, and exterior walls - are the highest-risk locations in any home. Follow the steps below to eliminate that risk before winter arrives.
Pipe insulation is the single most effective prevention measure. Foam pipe sleeves (also called pipe lagging) are available at any hardware store and cost roughly $0.50–$1.50 per linear foot. For extra protection in extreme cold, use heat tape rated for your specific pipe material before wrapping with foam sleeves.
Pay special attention to pipes that run along exterior walls, pipes in unheated garages near washing machines, and any copper or PVC lines in crawl spaces. Copper freezes faster than PEX (cross-linked polyethylene) tubing, which has more flexibility, but both will burst under sufficient pressure.
Cold air infiltration is what makes otherwise protected pipes vulnerable. A gap as small as 1/4 inch around a pipe penetration through an exterior wall lets in enough frigid air to freeze the pipe on a cold night. Use the following materials to seal those gaps:
Don't forget your garage. If water supply lines run through an attached garage - common in homes with laundry hookups - insulating that space or keeping the garage door closed during cold nights makes a significant difference.
Dropping your thermostat to 55°F at night to save on heating bills is fine. Dropping it to 50°F or below when your home has pipes on exterior walls is not. The minimum safe interior thermostat setting to protect pipes in a typical home is 55°F - but 60°F is a safer target if you have known vulnerable pipe locations.
If you're leaving for a vacation, do not turn your heat off entirely. Set it to 60°F and ask a neighbor to check the home during sustained cold snaps. A burst pipe while you're away for two weeks is a catastrophically expensive outcome compared to the cost of keeping the furnace running at a low setting.
On nights when the forecast drops below 20°F, open the cabinet doors under kitchen and bathroom sinks that are positioned against exterior walls. This allows warm interior air to circulate around the pipes. It costs nothing and takes ten seconds.
While those doors are open, let the cold-water side of the faucet drip slowly - a trickle of 1–2 drops per second is enough. Moving water freezes at a lower temperature than still water, and the slight pressure relief reduces the risk of a pipe rupturing even if some freezing does occur.
Outdoor hose bibs (spigots) are among the most commonly forgotten pipe freeze points. Water left in the supply line behind a hose bib will freeze and crack the pipe inside your wall. Before the first hard freeze each fall:
If your home has a frost-free sillcock (also called an anti-siphon hose bib), it's designed to drain automatically - but only if no hose is attached when the water is shut off. Always disconnect your hose first, or the frost-free feature is defeated.
Preparation means nothing if you can't respond fast when a pipe does freeze or burst. Every adult in your household should know exactly where the main water shut-off valve is located and how to close it within 60 seconds. In most homes, it's in the basement, utility room, or near the water meter.
Label the valve clearly with a tag. If the valve is old and difficult to turn, replace it with a ball valve - a quarter-turn ball valve is faster and more reliable than an aging gate valve.
Pipes begin to freeze when air temperatures surrounding them drop to 20°F (-6°C) or below and stay there for several hours. However, pipes on exterior walls in poorly insulated spaces can start freezing at temperatures as high as 32°F if air infiltration is severe. Wind chill does not directly affect pipes inside walls, but it accelerates heat loss from the wall assembly itself.
Yes. Letting the cold-water side drip at 1–2 drops per second accomplishes two things: it keeps water moving (which resists freezing) and it relieves pressure buildup. A pipe that freezes but has a pressure-relief path - an open faucet - is far less likely to burst than one that is sealed on both ends. Focus on faucets fed by pipes on exterior walls.
Pipe repair alone typically runs $500–$1,500 depending on pipe location and material. If water damage to drywall, flooring, insulation, or structural framing is involved - which is common when a pipe bursts while a homeowner is away - total remediation costs routinely reach $5,000–$15,000 or more. Homeowner's insurance generally covers sudden, accidental burst pipes, but not gradual leaks or damage caused by negligence like turning off the heat entirely in winter.
For crawl spaces that regularly fall below 20°F, use self-regulating electric heat tape applied directly to the pipe, covered with a foam pipe sleeve for added protection. For crawl spaces that stay above 20°F on most nights, 3/8-inch-wall foam pipe sleeves are sufficient and cost-effective. Always pair insulation with air sealing - foam alone won't protect a pipe that has direct cold-air infiltration blowing against it.
Shutting off the main water supply and draining the pipes is the most reliable protection if your home will be vacant for more than a week during winter. Turn off the main valve, then open faucets at the lowest and highest points in the house to drain residual water. This eliminates the risk entirely. If you keep water on, maintain interior heat at a minimum of 60°F and arrange for someone to check the property during any extreme cold events.
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