How to Prevent Frozen Pipes9 Things to Do Before Temperatures Drop

Freeze risk is mostly about location. Walk your home once and note where plumbing leaves the heated, insulated part of the house.

Two identical houses can have very different freeze risk depending on how the plumbing was routed. Your own walkthrough is worth more than any general rule.

The single most useful thing you can learn before winter is how to stop the water. When a pipe fails, minutes matter, and a burst pipe is not the moment to start searching.

• Find the main shutoff — often near where the water line enters the house, in a basement, crawl space, utility area, or near the water meter.
• Confirm the handle or lever actually turns. A valve that has not moved in years may need professional attention before you need it.
• Show every adult in the household where it is.
• Photograph it and note the location so it is not something you have to remember under stress.

If the shutoff is inaccessible, buried, seized, or in a space you cannot safely enter, do not force it. That is a good reason to have a plumber look before freezing weather, not during it.

A hose left connected keeps water trapped against the faucet and inside the connection. If that water freezes and expands, the damage often shows up on the pipe just inside the wall — where you cannot see it until it thaws and leaks.

• Disconnect every hose before the first hard freeze.
• Drain the hose and store it where it will not hold water.
• If the faucet has a dedicated indoor shutoff, close it and let the outdoor faucet drain.
• Do the same for splitters, timers, and quick-connect fittings — they hold water too.

Outdoor plumbing varies. Some homes have frost-proof hose bibs designed to keep water back inside the heated space. Others have standard faucets with water sitting right at the exterior wall. Some have a separate shutoff for the outdoor line; many do not.

An insulated faucet cover can reduce direct exposure on an accessible faucet. It is a reasonable, inexpensive step — but a cover alone does not guarantee freeze protection, especially if a hose is still attached or the pipe behind it runs through an unheated space.

Foam sleeves and wraps slow heat loss from the pipe and reduce how quickly it reaches freezing temperature. They are most worthwhile on exposed supply lines in crawl spaces, garages, attics, and unheated basements — the places you identified in step one.

• Insulation is sized to pipe diameter. Measure before you buy, and cover the pipe fully, including elbows and gaps.
• Insulation reduces exposure. It does not add heat, and it does not make a pipe freeze-proof in extended extreme cold.
• Skip anything you cannot reach safely. Crawl spaces and attics carry their own hazards.
• Leave heat tape and heat cable decisions to the product's own instructions or a professional — improper installation is a fire risk.

Helpful solution for this problem

Exposed supply lines in a cold crawl space, garage, or attic, where insulation is the practical preventive step.

Frost King 5S10XB6 Foam Tubular Pipe Insulation, 6 ft

Helpful for

Adding insulation around appropriately sized, accessible plumbing in vulnerable cold areas.

Why homeowners may find it useful

Pipe insulation is a relatively simple preventive measure for exposed plumbing, but it should be correctly sized and should not be treated as a guarantee against freezing.

Before choosing one

Measure the outside diameter of the pipe and the total length you need, including bends.

What it won't do

Fix an already frozen, damaged, or burst pipe.

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Sentinel Home may earn a commission from qualifying purchases at no additional cost to you. Products appear here because they may help with the problem described — not because of commission.

Moving cold air freezes a pipe far faster than still cold air. Look for the obvious pathways near vulnerable plumbing: an open crawl space vent, a gap where a pipe passes through the rim joist, a missing garage door seal, a hole left behind by an old installation.

Sealing those obvious gaps is usually a straightforward, low-cost improvement that also helps your heating bill.

When temperatures drop well below freezing, opening the cabinet doors under sinks on exterior walls lets heated room air reach the supply lines behind them. It is a small, free step that helps most in the coldest stretch of a cold snap.

• Open cabinets under kitchen and bathroom sinks on exterior walls.
• Move cleaners, drain products, and any hazardous chemicals out of reach of children and pets first.
• Keep interior doors open to rooms with plumbing so heat can circulate.
• Never use an oven, grill, or unvented fuel-burning heater to warm a room. That is a carbon monoxide risk.

Moving water is harder to freeze than still water, and letting a faucet run slightly can also relieve pressure buildup if ice does begin forming. In severe cold, allowing a small flow at a fixture served by particularly vulnerable plumbing can help.

This is a judgment call, not a universal rule. It is not something to do all winter, it uses water, and on a well system it also cycles the pump. Reserve it for genuinely extreme cold and for the fixtures at the end of your most exposed runs.

Freeze damage during travel is common and expensive. A home does not need to stay at comfortable temperature while you are away, but it does need enough heat to keep the plumbing above freezing — public safety guidance generally recommends keeping the thermostat set no lower than the mid-50s Fahrenheit in freezing weather.

• Leave the heating system on and set to a safe minimum temperature.
• Open interior doors and vulnerable sink cabinets before you leave.
• Ask someone to check the house during extended trips or a hard freeze.
• If the home will be empty for a long stretch, ask a plumber whether shutting off and draining the water system is appropriate for your plumbing.

Common signs during freezing weather:

• Little or no water flow at a fixture while the rest of the house works normally
• One bathroom or one sink affected, usually the one furthest along an exposed run
• Plumbing you already know runs through a garage, crawl space, attic, or exterior wall
• Visible frost or bulging on an exposed pipe

Sentinel is preparing a dedicated safe-thawing guide. Until it publishes, treat a suspected frozen pipe as a situation where stopping and calling a professional is a perfectly good decision.

• Vulnerable plumbing you cannot safely reach or inspect
• A home with known previous freeze damage
• Any active leakage, or a pipe that is cracked, bulging, or deformed
• Pipes that freeze repeatedly in the same place every winter
• A main shutoff you cannot find, cannot reach, or cannot turn
• Plumbing that would need to be rerouted, relocated, or repiped to solve the problem
• Well systems, pressure tanks, or fire-protection lines in unheated spaces

Sentinel's contractor experience is in early access. Until it opens, this routes to Sentinel's guidance and solutions for this system.