Cold-weather guide · Klamath Falls, OR
How to Prevent Frozen Pipes and What to Do If They Freeze
How to prevent frozen pipes comes down to three jobs: drain the outdoors, insulate and seal the cold spots, and keep water moving on the coldest nights. Here is each, plus what to do if one freezes.
Emergency? Call now, 24/7(541) 407-8900- Drain and insulateHoses off, hose bibs drained, cold runs wrapped.
- Drip on hard-freeze nightsA thin stream and open cabinet doors.
- Know your main shutoffFind it before a pipe splits.
The short answer on how to prevent frozen pipes
- Drain the outdoor lines in fallRemove hoses, shut off inside, drain the hose bibs.
- Insulate and sealFoam sleeves on exposed runs, caulk gaps where cold gets in.
- Keep heat and movement on cold nightsOpen cabinets, drip a tap, keep the furnace on.
- If one freezes, thaw gentlyOpen the tap, warm with a hair dryer, never a flame.
- If one splits, shut off the mainThen call a plumber right away.
Why pipes freeze and why a frozen pipe bursts
Knowing the mechanism tells you which pipes are at risk and why a small trickle of water helps.
Ice is only half the story
Water expands as it turns to ice. That alone does not usually split a pipe. The damage comes from what happens next: ice forms a plug in one spot, and as more of the water freezes, the water trapped between the plug and a closed faucet has nowhere to go. Pressure climbs in that short stretch until the pipe wall gives, often some distance from the ice itself.
That is why a pipe can split in a place that looks fine and show nothing wrong until it thaws. The crack is there while the ice holds it closed, and the water pours out once the plug melts. Everything in this guide is built around two ideas: keep the pipe from reaching freezing, and give pressure a place to go if it does.
Cold reaches the pipe
Unheated space, thin wall or open vent.
Ice forms a plug
Water stops moving past that point.
Pressure builds
Trapped water between plug and faucet.
The pipe splits
Often a lengthwise crack away from the ice.
Water flows on thaw
The leak shows when the ice melts.
How cold, how long
A brief dip below freezing rarely freezes a pipe that is inside a heated wall. What matters is how long a pipe stays cold and how exposed it is. Wind through a gap, a long run in an unheated space and a few hours of hard cold together are what do it. A mild freeze that lasts for days can do the same job as a short one that is very hard.
Pipes that carry moving water are harder to freeze than pipes with still water, which is why a slow drip from a tap is useful. Water that is moving also has a way out for any pressure that builds.
- Long cold stretchHours below freezing matter more than a single dip.
- Wind on an exposed pipeAir leaks speed the heat loss.
- Still waterPipes that are not being used freeze first.
- Thin or missing insulationLess barrier between the pipe and the cold.
- No heat in the spaceGarages, crawl spaces, attics, vacant rooms.
Where to look first when you want to prevent frozen pipes
Most freezes happen in a handful of places. Walk the house once and mark each one.
The usual spots, ranked by trouble
Look for any pipe that runs through a space the furnace does not heat. In practice that means pipes along exterior walls, runs in crawl spaces and unheated basements, lines in garages and attics, and the pipes behind kitchen and bath cabinets on outside walls. Outdoor faucets, called hose bibs or sillcocks, are the single most common failure point because they stick out into the cold.
Homes in the basin with a crawl space or a raised manufactured-home floor have long runs of supply pipe sitting in cold air under the house. Seasonal cabins and vacation homes are in a class of their own: without heat running, any water left in the lines is at risk for the whole season.
| Location | Why it freezes | What to do |
|---|---|---|
| Outdoor hose bib | Sticks out; water sits in the stem | Remove hose, shut off inside, drain; use a cover |
| Crawl space supply lines | Cold air and drafts under the floor | Seal vents in the cold season, insulate pipes |
| Under a manufactured home | Pipes sit under the floor in open air | Skirting, belly wrap, heat cable per its instructions |
| Garage and shop walls | Door gaps, no heat | Insulate, keep the door closed |
| Exterior-wall sink cabinets | Thin wall; cabinet traps cold air | Open cabinet doors on cold nights |
| Attic supply or sprinkler lines | Above the insulation, in cold air | Insulate over and around, drain if unused |
| Irrigation system | Water left in buried lines and backflow valve | Blow out or drain before the first hard freeze |
Hidden spots that surprise people
A pipe can be in a heated room and still freeze. Look at where the pipe enters the house, where it passes through a rim joist, where a wall has a cold bay and where a bathroom fan or a dryer vent has a gap. A water heater closet on an outside wall, a washer hookup in a garage and a laundry sink in an unfinished corner are also common.
- Rim joist and sill areaGaps let in cold air along the pipes.
- Wall bays behind a tubOften uninsulated on exterior walls.
- Bathroom fan and dryer ventsOpen dampers draw cold air in.
- Garage washer hookupHot and cold lines sit in unheated air.
- The meter pit or main entryWhere the water line comes in from outside.
How to prevent frozen pipes before the cold season starts
Autumn work takes an afternoon. A burst pipe in January takes weeks to repair.
A fall checklist in order
Do these in the first weeks of cooler weather, well before the first hard freeze. Disconnect and drain every garden hose, since a hose left on holds water into the bib and the pipe behind it. Shut off the inside valve to each outdoor faucet if it has one, open the outdoor faucet to drain, and leave it open until spring.
Then turn to the house. Seal gaps where pipes pass through walls and floors, close crawl space vents for the cold months if your home was built with them, and add insulation where pipes run through unheated areas. If you have an irrigation system, have it blown out or drained according to its instructions.
Drain the outdoors
Hoses off, bib valves closed inside, outdoor tap open to drain.
Seal the gaps
Foam or caulk where pipes pass through walls and floors.
Insulate exposed pipe
Sleeves on runs in crawl spaces, garages and attics.
Handle the sprinklers
Blow out or drain the irrigation system.
Know your main shutoff
Find it and test that it turns before you need it.
Know your shutoffs now, not later
In a freeze emergency every minute counts, and finding a stuck main valve in the dark with water spraying is the wrong time. Locate the main and each outdoor shutoff in the fall, and make sure the handles turn. Our guide to how to shut off the main water valve shows you how, and a valve that will not move or leaks at the stem is a repair for a plumber before winter.
It also helps to note where the meter is and where any heat cable controls or breakers live. If you rent, tell the landlord what you found and ask about the building’s shutoffs.
| Shutoff | Where to look | Test |
|---|---|---|
| Main water valve | Where the line enters, often a basement, utility closet or crawl space | Turn it closed and open once |
| Hose bib interior valve | On the supply line just inside the wall | Turn closed; open outdoor tap to drain |
| Water heater supply valve | On the cold inlet pipe at the heater | Confirm it turns |
| Irrigation shutoff | Near the backflow assembly | Closed before draining |
Insulating pipes and sealing the cold out
Two defenses work together: slow the heat loss from the pipe, and cut the cold air reaching it.
Choosing a defense for each pipe
Foam pipe sleeves are the simplest fix for exposed runs. They slow heat loss, they cost little in effort and they stay in place with tape or ties. Wrap right up to every elbow and fitting, and tape the seams. For pipes in an exterior wall, insulation in the wall cavity and sealed air gaps matter even more than the sleeve.
Heat cable, sometimes called heat tape, can protect a vulnerable run, such as a crawl space line. Use only a product made for pipes, follow the maker’s instructions to the letter, never overlap the cable and replace a damaged one. These products are a fire risk when misused, so unplug and stop using any cable with scorching or cracked insulation.
| Defense | Best for | Watch for |
|---|---|---|
| Foam pipe sleeve | Exposed runs in cold spaces | Gaps at elbows and valves |
| Wall and rim joist sealing | Pipes in exterior walls | Air leaks around penetrations |
| Heat cable made for pipes | Hard-to-insulate runs | Never overlap; follow instructions exactly |
| Hose bib covers | Outdoor faucets | Cover helps; draining the line is better |
| Skirting or enclosure | Under raised homes | Keep vents set for the season |
| Heated space nearby | Pipes close to a warm room | Does not help if the door stays shut |
Heat is the best insulation
No wrap stops a pipe from freezing if the cold lasts long enough, because insulation only slows the loss of heat. The strongest protection is warmth in the space itself. Keep the furnace running, keep the garage door closed, and let some house warmth reach pipes by opening cabinet doors on cold nights.
Check on the water heater too. A heater in an unheated garage or closet needs its pipes insulated, and a unit that fails in the middle of winter is a bad time for a repair. See water heater repair if yours is acting up before the cold season.
- Thermostat steadyAvoid setting the heat low when away.
- Cabinet doors open on cold nightsLets warm air reach pipes on exterior walls.
- Garage door kept closedLimits cold air on shared walls.
- Unused rooms kept above freezingCold rooms freeze pipes behind their walls.
- Heat cable inspectedCheck it before each season.
What to do on a hard-freeze night to keep pipes from freezing
When the forecast turns very cold, a few small habits cover most of the risk.
Tonight’s checklist
Open the cabinet doors under sinks that sit on outside walls so warm air can reach the pipes. Let a thin stream of water run from at least one tap, ideally a tap on the farthest or coldest side of the house. A pencil-lead stream is enough: moving water is harder to freeze and relieves pressure.
Keep the heat on and set it no lower than about 55 degrees when you are out, a general rule of thumb. Close the garage door and any crawl space access. If a heat cable is installed, confirm it is on. Make a habit of checking the coldest tap in the morning: if it is a trickle or nothing, treat it as a possible freeze and act right away.
Open the cabinets
Warm air reaches pipes on outside walls.
Drip one tap
A thin stream keeps water moving.
Keep the heat on
Do not turn it down when you leave.
Close the garage
And seal crawl space access.
Check the coldest tap
In the morning, test it first.
Away from home in winter
A house that sits empty is the riskiest one. If you leave for days, keep the heat on at a steady setting, ask someone to look in daily and tell them where the main shutoff is. For a longer absence or a seasonal home, many people shut off the main, open the taps to drain the lines and drain the water heater, a job a plumber can do correctly.
If you do leave the water on and the heat running, a neighbor or friend who knows the shutoff matters more than any gadget. A house you check within a day is a much smaller risk than one nobody sees for weeks.
| Plan | How | Best for |
|---|---|---|
| Heat on, someone checks daily | Steady setting, spare key, shutoff shown | Short trips |
| Main off, lines drained | Close main, open taps, drain the heater | Long absences, seasonal homes |
| Smart monitor | Temperature and leak sensors with alerts | An extra layer, not a replacement |
| Pipes drained and winterized | Done by a plumber | Cabins and vacation homes |
What to do if your pipes freeze, step by step
Move calmly. A frozen pipe that has not split can often be thawed without damage.
Thawing a frozen pipe safely
Signs of a frozen pipe: a tap that runs a trickle or nothing, frost on an exposed pipe, a bulge or crack, and sometimes a gurgling or whistle as water tries to pass. Start by opening the faucet served by the frozen line, so melting water has a place to go. Then find the frozen section, usually the coldest wall or space.
Warm it gently, starting at the faucet end and working back toward the ice. A hair dryer, a heating pad wrapped around the pipe or warm towels all work. Keep checking for leaks as ice melts. If the pipe is inside a wall, raise the room temperature and call a plumber instead of cutting into the wall.
Open the faucet
Let melting water flow out.
Find the frozen section
Coldest wall, crawl space or garage.
Warm gently
Hair dryer, heating pad or warm towels.
Work toward the ice
Start at the tap end and move back.
Check for leaks
Shut off the main if water appears.
What never to use
A blowtorch, a propane or kerosene heater, a camp stove or any open flame can ignite framing, melt solder joints and scald you. A pipe that is hot to the touch can burst from steam. Never run an electric appliance while you stand in water. And never try to force a stuck valve or keep heating a pipe that has already split.
No flames, ever
Open flame near a pipe is a fire risk and can destroy a soldered joint. If a hair dryer does not work, stop and call. A plumber can thaw a pipe with equipment designed for the job.
A frozen pipe has burst: shut off the water and get help
A split pipe is an emergency. The water often starts flowing as the ice melts.
The first ten minutes
Close the main water valve at once. Open the taps to drain the lines, and, if water is near electrical outlets or the panel, switch off power only if you can reach the breaker without standing in water. Move belongings out of the wet area and call a plumber. Our what to do when a pipe bursts guide takes you through the sequence in more detail, and burst pipe repair explains the repair.
Take photos and short video of the damage before cleanup. If you plan to claim any loss, our guide on whether homeowners insurance covers plumbing leaks and burst pipes sets out what to ask your insurer. For help right now, the emergency plumber line is open 24/7.
Main valve off
Stops the flow at its source.
Drain the lines
Open taps to relieve pressure.
Mind the electrics
Stay out of standing water near outlets.
Move belongings
Get contents away from the wet area.
Call and document
Plumber first, photos before cleanup.
After the thaw
Even if nothing leaked while the pipe was frozen, check once everything has thawed. Walk the house, look at ceilings and walls, listen for running water and watch the meter with everything off. A hairline crack may weep only a little but can wet insulation and framing for weeks. Our leak detection service finds the hidden ones, and our how to find a water leak in your house guide covers the meter test.
- Meter with everything offAny movement means a leak.
- Ceilings and wall cornersStains and sags show hidden water.
- Water pressure at every tapA split can cut flow.
- Crawl space and garageLook at the cold runs.
- Water heater areaCheck supply and relief pipes.
Permanent fixes that make frozen pipes much less likely
If one spot freezes year after year, the cure is a change to the pipe or the space, not more wrapping.
Rerouting, replacing and upgrading
A pipe that freezes every cold season is in the wrong place. A plumber can move a supply line out of an exterior wall, replace an old hose bib with a frost-free model that shuts the water off inside the heated wall, or run new pipe through a warmer path. See pipe repair for these fixes and repiping if a whole house has too many weak runs.
Some repairs are about air and warmth, not plumbing: sealing a rim joist, insulating a crawl space wall or fixing a garage door seal can be as effective as any pipe work. Old, corroded pipe also splits more easily, so if you have seen rust or pinhole leaks, our guide on signs of corroded pipes is worth a look.
| Chronic problem | Permanent fix |
|---|---|
| Hose bib freezes every year | Frost-free sillcock installed |
| Kitchen sink on an exterior wall | Reroute supply or add wall insulation |
| Crawl space line keeps freezing | Seal, insulate or reroute the run |
| Garage supply line | Insulate, heat the space or move the line |
| Old brittle pipe splits easily | Replace the section or the system |
What moves the price
No page can price a pipe job it has not seen. Cost follows access, material, pipe length, the number of runs involved and any wall or floor repair after the work. Ask about pricing when you call and say where the pipe is and how many times it has frozen.
- Where the pipe runsOpen crawl space or finished wall.
- How often it freezesA pattern points to rerouting.
- Pipe material and ageOld pipe may need more work.
- Is it already splitRepair after damage costs more than prevention.
Frozen pipe signs that call for a plumber
Some freezes you can thaw yourself. These you should not.
Water is leaking or spraying
Shut off the main and call. A split pipe cannot wait.
The frozen pipe is inside a wall or under a slab
Opening a wall or heating blind risks damage.
A pipe is bulging or cracked
Ice has already stressed the wall of the pipe.
Thawing is not working
Equipment made for the job beats guesswork.
Services for frozen and burst pipes
From a thaw to a repiped crawl space.
Burst pipe repair
Fast repair when a frozen pipe splits.
Burst pipe repair details →Emergency plumber
Night or day, call about water you cannot stop.
Emergency plumber details →Pipe repair
Replace the weak run that keeps freezing.
Pipe repair details →Leak detection
Find hidden damage after a thaw.
Leak detection details →Questions about how to prevent frozen pipes
How to prevent frozen pipes when a hard freeze is forecast?
Open the cabinet doors under sinks on outside walls, let a thin stream run from a tap on the coldest side of the house, keep the furnace on and the garage door closed. Disconnect and drain hoses and outdoor faucets before the cold arrives.
Should I leave my faucets dripping?
On a hard-freeze night, yes, on the coldest taps. Moving water is harder to freeze, and a trickle relieves pressure if ice forms. Open both hot and cold on a mixing tap if you can. Turn them off when the weather warms.
What temperature should I keep my house at to avoid frozen pipes?
A common rule of thumb is no lower than about 55 degrees when you are away, and your normal setting when you are home. The right level also depends on how much cold reaches your pipes, so a house with exposed runs may need more.
How do I thaw a frozen pipe safely?
Open the faucet, then warm the pipe slowly with a hair dryer, heating pad or warm towels, starting near the faucet. Never use a torch, a propane heater or any open flame. If you cannot find the frozen section, or it is in a wall, call a plumber.
Will my pipes burst if they freeze?
Not always. Many freeze without splitting, especially if you thaw them gently. But the risk is real: the pipe can crack where pressure builds, and the crack may only show when the ice melts. Check carefully after a thaw.
Is it enough to wrap pipes in insulation?
It helps, but insulation only slows heat loss. A pipe in a cold space with no heat can still freeze in a long cold spell. Combine insulation with sealing air gaps, warming the space and keeping water moving on the coldest nights.
What should I do with outdoor faucets before winter?
Remove hoses, close the inside shutoff valve if there is one, open the outdoor faucet to drain, and leave it open. A frost-free faucet helps, but it still needs its hose removed or it can hold water and freeze.
Does homeowners insurance cover frozen pipes?
Policies differ, and coverage often depends on the cause and the steps you took. Read your own policy and ask your insurer. Our guide on insurance for plumbing leaks and burst pipes lists the questions to ask.
How much does it cost to fix a burst frozen pipe?
It depends on where the pipe is, how much of it must be replaced, the material and the repair to walls or floors afterward. Ask about pricing when you call and describe where the split is.
Can I get a plumber on a freezing night?
Yes. The line is open 24/7 and same-day service is available. If water is flowing, close the main first, then call. Our burst pipe repair page explains what happens next.
More guides for winter and leaks
Pipe frozen or split? Call now.
Shut off the main if water is flowing, then call. Open 24/7, with same-day service available. Ask about pricing when you call.