How to Prevent Pipe Bursts This Winter: Complete Guide

A single burst pipe can release 4 to 8 gallons of water per minute. In the time it takes you to notice and shut off the water, even 15 minutes, that is 60 to 120 gallons soaking into your floors, walls, and ceilings. The average insurance claim for frozen pipe water damage is over $11,000 according to State Farm data. The good news is that pipe bursts are almost entirely preventable with the right preparation. Here is everything you need to do before and during winter to protect your home.

Understanding Why Pipes Burst

Contrary to common belief, pipes do not burst because ice blocks the pipe and water pressure builds up behind it. The actual mechanism is more nuanced and important to understand for effective prevention.

When water freezes inside a pipe, it expands by approximately 9 percent. This expansion creates a plug of ice. Between the ice plug and the closed faucet, water is trapped. As the ice continues to expand, it increases the pressure in this trapped section of water to extreme levels, sometimes exceeding 2,000 PSI. It is this pressure that ruptures the pipe, often at a point that is not even frozen.

This is why the most effective prevention strategies focus on two things: keeping pipes warm enough to prevent freezing, and providing a path for pressure relief if freezing begins.

Identify Your Vulnerable Pipes

Not all pipes are equally at risk. Focus your prevention efforts on these high-risk areas:

Pipes in Exterior Walls

Pipes running through exterior walls, especially on the north side of the house, are the most common location for freezing. The wall insulation may not be adequate, especially in older homes. Kitchen sinks and bathroom fixtures on exterior walls are prime targets.

Pipes in Unheated Spaces

Garages, crawl spaces, attics, basements, and unheated utility rooms expose pipes to ambient outdoor temperatures. A garage with an attached water heater is a particularly common failure point.

Outdoor Hose Bibs and Spigots

Outdoor faucets are directly exposed to freezing temperatures. If the supply line behind the hose bib does not have a shutoff valve, or if a hose is left connected, the pipe behind the exterior wall can freeze and burst inside your home.

Pipes Near Windows, Doors, or Vents

Any penetration in the building envelope lets cold air reach pipes. Gaps around windows, door frames, dryer vents, and cable entry points can channel freezing air directly onto nearby pipes.

Prevention: What to Do Before Winter

1. Insulate Exposed Pipes

Pipe insulation is the single most cost-effective prevention measure. Foam pipe insulation sleeves cost $2 to $4 for a 6-foot section and take minutes to install.

Foam sleeves: The most common option. Slit one side, slip over the pipe, and secure with tape. Use for all exposed pipes in unheated areas.
Fiberglass wrap: Better for irregular pipes or pipes with many fittings. Wrap and secure with wire or tape.
Heat tape (heat cable): For pipes in the most vulnerable locations, self-regulating heat tape provides active warming. It plugs into an outlet and uses a thermostat to maintain pipe temperature above freezing. Costs $50 to $100 for a 24-foot section plus energy costs. This is the best option for pipes that have frozen before.

Focus on pipes in crawl spaces, garages, attics, and exterior walls. Even pipes in heated basements benefit from insulation if they run near exterior walls or windows.

2. Seal Air Leaks Near Pipes

Cold air infiltration is a bigger risk factor than low outdoor temperature for many pipe locations. Use caulk or expanding foam to seal gaps around:

Where pipes penetrate exterior walls or floors
Around window and door frames near plumbing
Where dryer vents, cable lines, or other utilities enter the building
Rim joist areas in the basement (the junction where the foundation meets the framing)
Any visible daylight in areas near plumbing

3. Disconnect and Drain Outdoor Hoses

Before the first freeze:

Disconnect all garden hoses from outdoor faucets
If you have a shutoff valve for exterior hose bibs (many homes do, typically in the basement near the exterior wall), close it
Open the outdoor faucet to drain any remaining water from the line
Install insulated faucet covers ($3 to $8 each) over outdoor hose bibs

Leaving a hose connected prevents the line from draining and creates a direct path for freezing to enter your home's plumbing system.

4. Service Your Heating System

A furnace failure during a cold snap is one of the most common triggers for widespread pipe freezing. Schedule your annual HVAC maintenance before winter starts. Replace the filter, test the thermostat, and verify the system operates reliably.

5. Know Your Main Shutoff Valve

If a pipe does burst, your ability to shut off the water supply quickly determines how much damage occurs. Locate your main water shutoff valve now, not during an emergency. Test it to make sure it turns freely. If it is stuck, corroded, or difficult to operate, have a plumber service or replace it. Label it clearly so any household member can find and operate it.

Prevention: During Cold Weather

Keep Your Thermostat at 55 Degrees Fahrenheit or Higher

Never set your thermostat below 55 degrees Fahrenheit, even when you are away or sleeping. This is the minimum temperature that keeps most interior pipes above freezing. Some people lower the thermostat to save on heating costs, but a single frozen pipe event costs far more than a winter of modestly higher energy bills.

Open Cabinet Doors

Kitchen and bathroom cabinets on exterior walls insulate pipes from the warm indoor air. During cold snaps, open the cabinet doors to let warm air circulate around the pipes. This is especially important for sinks on exterior walls.

Drip Faucets During Extreme Cold

When temperatures drop below 20 degrees Fahrenheit (or below 28 degrees for pipes in poorly insulated areas), open faucets served by vulnerable pipes to a slow, steady drip. This serves two purposes: the slight flow of water makes it harder for ice to form, and the open faucet provides pressure relief if ice does begin forming, reducing the likelihood of a burst.

Focus on faucets at the end of long pipe runs or served by pipes in exterior walls. You do not need every faucet dripping. Both hot and cold lines should drip if both run through vulnerable areas.

The water cost is negligible. A dripping faucet uses about $1 to $3 worth of water per month. Compare that to the average $11,000 frozen pipe insurance claim.

Maintain Heat in All Areas

Close any gaps that separate heated areas from unheated areas. If your garage has plumbing (water heater, laundry connections, utility sink), keep the garage door closed. If certain rooms tend to be much colder than the rest of the house, keep their doors open to allow heat circulation.

What to Do If You Are Traveling

Leaving your home vacant during winter is one of the highest-risk scenarios for pipe freezing. Take these precautions:

Keep the heat on. Set the thermostat to at least 55 degrees Fahrenheit. Do not turn the heat off to save money while you are away.
Ask someone to check the house. Have a neighbor, friend, or property manager check your home daily (or at least every 2 to 3 days) during cold weather. A furnace failure on the day you leave could mean frozen pipes within 24 hours.
Consider shutting off the main water supply. If you will be gone for an extended period (more than a week), turn off the main water supply and open all faucets to drain the system. This eliminates the water that would cause damage if a pipe did freeze.
Install a smart thermostat or temperature monitor. Smart thermostats send alerts to your phone if the indoor temperature drops below a set threshold. Standalone temperature monitors ($20 to $50) with Wi-Fi connectivity can do the same thing without replacing your thermostat.

What to Do If a Pipe Freezes (Before It Bursts)

If you turn on a faucet and only a trickle comes out, or nothing at all, a pipe may be frozen. Act quickly:

Keep the faucet open. As the ice melts, water needs somewhere to go. The open faucet provides that relief.
Apply heat to the frozen section. Use a hair dryer, heat lamp, electric heating pad wrapped around the pipe, or towels soaked in hot water. Start at the faucet and work toward the frozen section so that melting water can flow out.
Never use an open flame. Blowtorches, propane heaters, or charcoal grills can damage pipes, start fires, or produce deadly carbon monoxide in enclosed spaces.
Check all faucets. If one pipe is frozen, others may be too. Test every faucet in your home.
If you cannot locate the frozen section or cannot thaw it, call a plumber. They have specialized equipment (pipe thawing machines) that can safely thaw frozen pipes, including those inside walls.

Signs a Pipe Is About to Burst

Watch for these warning signs during cold weather:

Reduced water pressure from specific faucets (indicates partial freezing in the supply line)
Frost or condensation visible on exposed pipes
Strange sounds (clanking, banging, or gurgling) when you turn on faucets
Bulging or visible cracks in exposed pipes
Unpleasant odors from drains (a frozen pipe can trap sewer gas)

If you notice any of these signs, take immediate action to thaw the pipe and consider calling a plumber to assess the situation before a burst occurs.

If a Pipe Does Burst

Despite your best efforts, a pipe may still burst. If it happens:

Shut off the main water supply immediately. Every second counts.
Turn off electricity to the affected area if water has reached electrical outlets or appliances.
Begin documenting the damage with photos and video for your insurance claim.
Call a professional. A burst pipe water damage specialist can begin extraction and drying immediately.
Start removing water if you can do so safely while waiting for professionals.

Prevention is always cheaper than restoration. The supplies and steps in this guide cost less than $200 and a few hours of time. The damage they prevent averages over $11,000. If you do experience a pipe burst this winter, contact us immediately for emergency service. We connect homeowners in Jackson, Shreveport, and Boise with licensed professionals who respond within the hour for emergency water extraction and restoration.