During a cold snap, combine steady indoor heat, access to warmer air, a small flow of cold water through vulnerable lines, and proper protection of outdoor plumbing. Set the thermostat consistently day and night, open cabinets around pipes, keep garages closed, and let a faucet served by exposed plumbing drip. Before severe weather, drain outdoor hose lines, insulate accessible pipes, and address drafts around pipes in exterior walls. If a faucet produces only a trickle, leave it open and thaw the suspected section with gentle heat—never an open flame.
Why freezing water breaks pipes
Water expands as it freezes. In a closed section of plumbing, that expansion can create enough pressure to split a pipe or damage a joint. The break may not become obvious until the ice melts and pressurized water escapes, so preventing the freeze is safer than waiting for a leak.
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Risk depends on the pipe’s location, airflow and insulation—not on a single temperature that applies to every home. Pay particular attention to:
- Outdoor water lines and hose bibs.
- Pipes in unheated basements, crawl spaces, attics and garages.
- Hot- and cold-water pipes inside cabinets under kitchen or bathroom sinks.
- Pipes routed along exterior walls with little insulation.
- The area where the water service enters through the foundation.
A home can have several vulnerable sections at once. Protect both hot and cold lines wherever they pass through a cold or drafty space. A warm room does not necessarily mean a pipe inside an exterior wall or near a foundation opening is warm enough; air movement and missing insulation can keep that section much colder.
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What to do immediately when a cold snap arrives
Use these measures together when practical. The American Red Cross does not rank dripping water, cabinet ventilation and steady heat as competing remedies; each addresses a different exposure.
Keep the heat steady
Keep your thermostat at the same setting day and night. Avoid a nighttime setback during the coldest period because the temperature around pipes can fall substantially while the house is cooler. If you leave home, the American Red Cross recommends leaving the heat on at no lower than 55°F. That is Red Cross guidance for an absence, not a universal building-code threshold or a guarantee for every plumbing layout.
Check that the heating system is actually operating in rooms where plumbing is routed. Closing interior doors or blocking supply vents can leave a cabinet, basement or other plumbing area colder than the thermostat location. Do not respond to a cold snap by turning the heat off in unused rooms if those rooms contain water lines.
Open cabinets around plumbing
Open kitchen and bathroom cabinet doors so warmer room air can reach the supply lines. First move cleaners, medicines and other hazardous products out of children’s reach. Opening a cabinet cannot compensate for a severe draft or an unheated wall cavity, but it can raise the air temperature around otherwise enclosed pipes.
Close the garage
If water lines run through a garage, keep the garage door closed. A large opening can expose pipes to much colder air than the living space, even when the rest of the house is heated. Avoid leaving the door partly open for convenience while a freeze is possible.
Let a vulnerable faucet drip
Let cold water drip from the faucet served by exposed plumbing. The American Red Cross states, “Running water through the pipe – even at a trickle – helps prevent pipes from freezing.” Use the faucet connected to the line you are protecting rather than assuming a drip at any sink will protect every branch.
The Red Cross does not specify one flow rate for all homes. A drip uses water, so concentrate this measure on vulnerable lines and follow any local utility restrictions. Dripping is especially useful when a pipe is exposed to cold air, but it does not replace heat, cabinet ventilation or draining an outdoor line that can be taken out of service.
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A practical cold-snap checklist
- Identify the coldest plumbing first. Check garages, crawl spaces, attics, unheated basements, sink cabinets and exterior walls.
- Set the thermostat and leave it there. Keep the setting steady through the night.
- Open sink cabinets. Remove hazardous products before opening doors where children can reach them.
- Close garage doors. Do this wherever water lines are present.
- Choose a faucet for a controlled drip. Select one served by the exposed section and monitor it for the duration of the coldest weather.
- Check more than one fixture. A cold snap can freeze multiple branches, not just the line nearest the dripping faucet.
- If leaving, keep the heat on. Use the Red Cross minimum recommendation of 55°F for an away-from-home setting.
- Confirm outdoor lines are out of service. Remove hoses, close the indoor supply valve and leave the outdoor bib open to drain before temperatures fall further.
- Keep access clear. Do not cover a pipe, valve or faucet with stored items in a way that prevents inspection, drainage or safe thawing.
Prepare before severe weather
Map vulnerable plumbing
Walk through the home before the forecast turns severe. Note where hot and cold pipes pass through unheated rooms, exterior walls, cabinets, garages and openings around the foundation. Mark accessible sections that can be insulated and identify which faucet is supplied by each exposed run. Knowing the route makes it easier to choose a drip point and to locate a frozen section later.
Pay special attention to the point where the water service enters through the foundation. That area can be colder than nearby finished rooms, and a restriction there can affect several fixtures. Check both hot- and cold-water pipes; either can freeze when exposed to sufficiently cold conditions.
Insulate accessible pipes
Purpose-made pipe insulation can slow heat loss from exposed plumbing. Common forms described by the U.S. Department of Energy include tubular pipe sleeves, spiral wrap and fiberglass batts. Insulation reduces the rate at which a pipe loses heat; it is not a guarantee that the water cannot freeze, especially in a prolonged outage or a space exposed to outdoor air.
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Inspect existing insulation before a cold snap. A sleeve that has pulled apart, leaves a gap at a fitting or allows air to move around the pipe needs attention. Insulation should not conceal a leak or prevent access to a shutoff valve, and it should be installed according to the product directions.
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The American Red Cross mentions UL-listed heat tape or heat cable for exposed pipes. Select a product intended for the pipe and location, follow every installation and electrical-safety instruction, and comply with applicable local requirements. Do not improvise an installation or assume that one product’s spacing, controls or temperature rating applies to another.
Disconnect and drain outdoor hoses
- Remove garden hoses, drain them and store them in a protected place.
- Close the indoor shutoff valve supplying the outdoor hose bib.
- Open the outdoor bib and leave it open so remaining water can drain.
This prevents a trapped column of water from freezing in the hose connection and adjacent line. If your plumbing has a different arrangement, use the shutoff and drainage procedure specified for that installation. Simply removing the hose without closing the indoor valve may leave the supply line full of water.
Drain pool and sprinkler supply lines correctly
Drain pool and sprinkler supply lines according to the manufacturer’s or installer’s directions. Do not add antifreeze unless those directions specifically require it. The American Red Cross warns that inappropriate antifreeze use can create environmental and poisoning risks. Different systems have different low points, valves and blowout procedures, so do not substitute a generic method.
Preparing a home that will be empty
Before leaving during cold weather, keep the heating system running and set it no lower than 55°F, following the American Red Cross recommendation. Protect or drain exposed outdoor lines as described above, and make sure cabinet doors around vulnerable indoor plumbing can remain open safely. If you cannot leave cabinets open because children or pets may enter, remove hazardous products first or use another safe way to protect them.
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Walk the route from the heat source to unheated spaces and look for open garage doors, drafts and pipes that were not visible during normal use. The 55°F recommendation is not a promise that every pipe will remain above freezing; a line in an exterior wall, attic or crawl space may still need insulation, air sealing or drainage. Arrange for someone to notice a heating failure or a leak if the property will be unattended for an extended period.
How to fit foam pipe insulation sleeves
For accessible exposed plumbing, foam pipe insulation sleeves—also called tubular pipe insulation—are a practical starting point. The sleeve must fit the pipe and be installed without open seams or gaps.
- Measure the pipe. Measure the pipe’s outside diameter, then choose a sleeve whose inside diameter matches it snugly.
- Measure the run. Include bends, fittings and any section that passes through a cold opening.
- Cut the sleeve. Cut pieces to the required lengths with clean, square ends.
- Close every seam. Bring the slit edges together and seal seams as directed by the product manufacturer.
- Eliminate gaps at joints. Fit adjoining pieces tightly around elbows, tees and valves; an uninsulated gap can remain a cold spot.
- Secure the insulation. Keep sleeves from sliding or opening, using the fastening method specified for the product.
- Seal penetrations. Seal holes where pipes pass through walls so cold air cannot flow around the insulation.
For pipe in an exterior wall, the Department of Energy’s Building Science Education guidance calls for more than a sleeve: insulate the pipe, provide suitable cavity insulation behind it, and air-seal the cavity so outside air cannot circulate around the pipe. A sleeve placed over a pipe in a leaky, poorly insulated wall may still leave the water vulnerable.
When shopping, “foam pipe insulation sleeves” and “tubular pipe insulation” describe the physical products used for accessible exposed plumbing. Match the product to the pipe diameter and installation conditions rather than choosing by appearance alone. Product instructions determine whether seams need a particular tape, adhesive or fastening method.
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What the insulation figures do—and do not—mean
The U.S. Department of Energy Building America program reports that uninsulated hot-water pipes can account for 16% to 23% of distribution heat loss, depending on climate. The same Building Science Education material reports a 4% to 5% annual reduction in overall water-heating energy use from adding ¾-inch pipe insulation. The page does not state a publication year for these figures.
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Those percentages describe energy use, not a measured percentage reduction in freeze risk. They should not be presented as a promise that a particular sleeve, thickness or installation will prevent freezing. A well-fitted sleeve is one part of a broader approach that may also require cavity insulation, air sealing, steady heat and drainage of lines that can be taken out of service.
Dripping versus relying on heat and cabinet measures
| Situation | Most useful action | Important limitation |
|---|---|---|
| An occupied home with a pipe exposed to cold air | Keep heat steady, open nearby cabinets and let the served faucet drip. | No universal drip rate is established; focus on the vulnerable branch. |
| Pipes inside an unheated garage, attic or crawl space | Maintain indoor heat, close openings and add suitable insulation before the cold snap. | Room temperature may not reach the pipe; insulation does not guarantee freeze protection. |
| An exterior-wall pipe | Insulate the pipe, insulate the cavity behind it and air-seal around it. | A sleeve alone does not stop cold air moving through the wall cavity. |
| A house left empty in cold weather | Leave heat on at no lower than 55°F, per American Red Cross guidance; protect or drain exposed lines. | 55°F is a Red Cross recommendation, not a universal threshold for every building. |
| An outdoor hose connection | Remove the hose, close the indoor valve and leave the outdoor bib open to drain. | Follow the actual configuration of the home’s plumbing. |
These measures can be combined. The right choice depends on where the pipe runs, whether the home is occupied, whether an outdoor line can be drained, and whether you are preparing in advance or responding to a suspected freeze. The guidance does not establish a temperature at which every pipe freezes or a controlled product ranking, so location and installation details should drive the decision.
How to recognize a pipe that may already be frozen
A faucet that produces only a trickle when other fixtures have normal pressure is a warning sign. Likely locations include a pipe against an exterior wall or a section near the point where the water service enters through the foundation. More than one pipe may be frozen, so check other faucets rather than assuming there is only one blockage.
Do not wait for a visible split before responding. Ice can restrict flow while pressure builds in a closed section, and water may escape only after thawing begins. Keep the affected fixture open and inspect accessible areas before deciding whether professional help is needed.
Safe thawing steps
- Open the affected faucet. Leave it open while you work. As ice melts, the open outlet gives expanding water a path to move.
- Find the cold section. Inspect exposed pipe near exterior walls, unheated spaces and the service entry. If you cannot locate the section, do not dismantle inaccessible areas yourself.
- Apply gentle heat. Use an electric heating pad, a hair dryer, a portable space heater positioned away from flammable materials, or towels soaked in hot water.
- Work gradually. Warm the pipe along its length rather than concentrating intense heat at one point. Continue until normal flow returns.
- Check other fixtures. Test additional faucets for reduced flow, since a second branch may also be frozen.
- Watch for leakage as flow returns. If thawing reveals water escaping from a split or joint, stop and seek a licensed plumber rather than continuing to heat the line.
Heat sources to avoid
- Blowtorches and other open-flame devices.
- Kerosene or propane heaters used against the pipe.
- Charcoal stoves.
- Any improvised flame or high-heat method that can ignite nearby materials or damage the pipe.
If the frozen section cannot be located, is inaccessible, or will not thaw with gentle heat, call a licensed plumber. Professional help is also the safer choice when reaching the pipe would require opening a wall, entering a hazardous space or placing electrical equipment near water.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Common mistakes that leave pipes exposed
Turning the thermostat down at night
A nighttime setback can allow vulnerable areas to cool when there is no daytime activity to add heat. Keep the setting steady during the coldest weather.
Opening cabinets without removing dangerous products
Cabinet ventilation helps plumbing, but it can put cleaners and chemicals within a child’s reach. Relocate them first.
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Water moving through one line does not establish flow through every branch. Choose the faucet supplied by the exposed plumbing whenever possible.
Assuming insulation is a guarantee
Loose sleeves, open seams, unsealed wall penetrations and drafts can defeat an otherwise suitable insulation product. Fit, continuity and air sealing matter.
Using antifreeze in outdoor systems without instructions
Pool and sprinkler systems have different drainage requirements. Follow the manufacturer’s or installer’s directions; do not add antifreeze on your own.
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Using an open flame to thaw a pipe
Open flame can start a fire and damage plumbing. Use only the gentle electric or hot-water methods listed above, or call a licensed plumber.
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A drip protects the branch it serves, not necessarily every pipe in the building. Check multiple faucets and inspect separate cold spaces, especially when the water service enters through the foundation or branches into exterior walls.
When professional help is the right next step
- The suspected frozen section cannot be found.
- The pipe is behind a wall or in an unsafe, inaccessible space.
- Gentle heat does not restore flow.
- Several fixtures show reduced flow and you cannot identify the affected branches.
- You cannot safely follow the electrical or product instructions for heat tape or heat cable.
- Thawing exposes a split, leaking joint or other damage.
A licensed plumber can locate inaccessible sections and thaw them without the hazards associated with improvised heating. The American Red Cross specifically recommends calling one when a frozen area cannot be located, cannot be accessed or cannot be thawed.
Frequently Asked Questions
What temperature should I leave my house at when I am away in cold weather?
The American Red Cross recommends leaving the heat on at no lower than 55°F. This is guidance for an absence, not a universal threshold that guarantees every pipe will stay above freezing; pipes in exterior walls, attics, crawl spaces and other cold locations may need additional protection or drainage.
Should I drip hot or cold water?
The Red Cross guidance calls for letting cold water drip from a faucet served by exposed plumbing. Choose the fixture connected to the vulnerable branch, because a drip at another sink may not move water through that line.
How fast should the faucet drip?
The cited guidance does not set one flow rate for every home. Use a small, continuous flow when appropriate, focus it on the exposed branch and follow local utility restrictions.
Will foam pipe insulation sleeves guarantee that pipes will not freeze?
No. Tubular or foam sleeves slow heat loss, but gaps, poor fit, drafts and an uninsulated exterior-wall cavity can still leave a pipe vulnerable. Fit the sleeve snugly, close seams, secure it and air-seal wall penetrations; use steady heat and drainage measures as needed.
What should I do if a faucet only produces a trickle?
Leave the faucet open, inspect accessible pipes near exterior walls, unheated spaces and the foundation service entry, and apply gentle heat with an electric heating pad, hair dryer, carefully positioned space heater or hot-water towels. Never use an open flame. Call a licensed plumber if the section cannot be found, reached or thawed.
Is antifreeze appropriate for pool or sprinkler lines?
Only use it if the manufacturer’s or installer’s directions specifically require it. The American Red Cross warns that inappropriate antifreeze use can create environmental and poisoning risks; follow the system’s specified drainage procedure instead.
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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsWhat is the correct way to protect an outdoor hose bib?
Remove and drain the hose, close the indoor shutoff valve supplying the bib, and leave the outdoor bib open so remaining water can drain. Use the procedure specified for your plumbing configuration if it differs.
The Bottom Line
Before a cold snap, identify cold and drafty plumbing, drain outdoor lines and fit accessible pipes with sealed, snug insulation. During the freeze, keep heat steady, open cabinets, close garages and drip cold water from a faucet serving an exposed branch. If flow falls to a trickle, leave the faucet open and thaw gradually with safe electric or hot-water methods; never use an open flame, and call a licensed plumber when the section is inaccessible or will not thaw.
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