How to Prevent Frozen Pipes: 10 Steps Before the Cold Hits
How to prevent frozen pipes: insulate exposed lines, seal drafts, keep heat at 55°F or above, open cabinets, drip a faucet and drain outdoor taps before winter.
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How to prevent frozen pipes: insulate pipes in cold spaces, seal drafts, keep the heat at 55°F or higher, open cabinet doors under sinks, let a faucet drip on the coldest nights, disconnect and drain outdoor hoses and shut off outdoor taps, and know where your main shutoff is. A little preparation costs far less than a burst pipe.
How to prevent frozen pipes: the plan
Frozen pipes happen when cold air reaches plumbing for hours. The fix is to keep cold air away from the pipes, keep warm air near them and keep water moving or drained. Start in autumn, before the first hard frost.
| Quick facts: how to prevent frozen pipes | |
|---|---|
| Thermostat | Keep at 55°F (13°C) or higher, even when away |
| Insulate | Pipes in attics, crawl spaces, garages and exterior walls |
| Cold-night habits | Open cabinet doors; let a faucet drip |
| Outdoors | Disconnect hoses, drain and shut off outdoor faucets |
Before winter
- Disconnect garden hoses and drain them. A hose left on lets ice back up into the pipe.
- Shut off the indoor valve to outdoor faucets if there is one, then open the outdoor tap to drain.
- Insulate exposed pipes with foam sleeves or wrap, starting with those in unheated areas.
- Seal gaps around pipes where they enter walls, with caulk or foam.
- Cover foundation vents and fix broken basement windows.
- Find your main shutoff and make sure it works. Tag it so anyone can find it fast.
- Check heat tape if you have it, and follow the instructions exactly.
On the coldest nights
- Open cabinet doors under kitchen and bathroom sinks, especially on exterior walls, so warm air gets to the pipes.
- Let a faucet drip on the farthest tap from the water entry, a thin steady stream is enough.
- Keep the heat on, at 55°F or above, and keep interior doors open to spread warmth.
If you are away
Leave the heat at 55°F or higher. Ask someone to check the house daily during a cold snap. Consider shutting off the main water and draining the system if the house will be empty for a long period, in line with your insurer's advice.
Where to insulate first
| Location | Priority |
|---|---|
| Exterior wall pipes | High |
| Attic and crawl space pipes | High |
| Garage pipes | High |
| Pipes near vents and drafts | High |
| Interior pipes in heated space | Lower |
What not to do
Do not use space heaters unattended near pipes, and never thaw a pipe with an open flame. Do not tape or wrap pipes with materials that trap moisture. Do not rely on one measure alone, because each protects against a different risk.
Know the warning signs
A faucet that runs with only a trickle, frost on pipes, a cold spot on a wall or strange smells from a drain can mean ice is forming. Act early with gentle heat and an open tap.
A quick checklist before the first freeze
- Hoses off and drained, outdoor taps closed.
- Foam insulation on pipes in the attic, crawl space and garage.
- Gaps around pipes sealed with caulk or foam.
- Thermostat set to 55°F or higher.
- Main shutoff located, tagged and tested.
- A plan for who checks the house if you are away.
What to do the day before a hard freeze
Open cabinet doors, set a faucet to drip, check the forecast and make sure everyone in the house knows where the main shutoff is. If you use a space heater near a cold spot, keep it on a hard floor, away from fabric and never leave it unattended. These last-minute steps are the practical finish to how to prevent frozen pipes in your home.
When to call a professional
If pipes freeze repeatedly in the same place, you find a split pipe or water leaking from a wall, shut off the main water and call a plumber. Learning how to prevent frozen pipes is useful, and in an old house a plumber can reroute or insulate trouble spots permanently.
Related reading
- How to prevent burst pipe: A Step-by-Step Guide
- How to Thaw Frozen Pipes Safely: 6 Steps and What to Avoid
- At What Temperature Do Pipes Freeze? The 20°F Rule and Risks
- Complete Guide: What to Do When a Pipe Bursts in Your House
Browse all plumbing guides, or find a plumber in your city from the plumbing directory.
Frequently asked questions
How do I prevent frozen pipes?
Insulate exposed pipes, seal drafts, keep the thermostat at 55°F or above, open cabinet doors under sinks, let a faucet drip on the coldest nights and drain and shut off outdoor taps. Know where the main shutoff is.
What temperature should I keep the house to avoid frozen pipes?
Keep the heat at 55°F or higher, even if you are away. Lower temperatures let cold reach exterior walls and attic pipes. In a severe freeze, a few degrees higher is safer.
Should I let my faucet drip to prevent freezing?
Yes, on the coldest nights. Moving water freezes less easily and a drip relieves pressure if ice forms. Choose the tap farthest from where water enters the house and use a thin steady stream.
Is hot or cold water better to drip?
Either works, and many people let both drip slightly. Running water in the pipe is what matters. If you have one faucet to choose, pick the one on the exterior wall or farthest from the water entry.
Should I open cabinet doors to prevent pipes freezing?
Yes. Opening the doors under sinks on exterior walls lets warm room air reach the pipes. Move cleaning products out of reach of children and pets first. Leave them open overnight during the coldest weather and close them again when it warms up.
How do I protect outdoor faucets from freezing?
Disconnect hoses, drain them and shut off the indoor valve to the outdoor tap if there is one. Open the outdoor faucet to drain the pipe, and add an insulated faucet cover for extra protection.
Can I use heat tape on pipes?
Yes, if it is designed for plumbing and installed as instructed, ideally with a built-in thermostat. Never overlap it unless the maker allows, and replace old or damaged tape. Follow the safety instructions carefully.
How to prevent frozen pipes when I go away for winter?
Keep the heat at 55°F or higher, have someone check the house, and consider shutting off the main water and draining the lines if the house will be empty a long time. Check your insurance terms.
Does pipe insulation really help?
Yes. Foam sleeves slow heat loss and give extra hours before freezing, especially in attics, crawl spaces and garages. Insulation does not replace heat, so combine it with warmth and sealing drafts.
When should I call a plumber to prevent frozen pipes?
Call if pipes in the same spot freeze each winter, they run through very cold areas, or you want a permanent fix such as rerouting or heavy insulation. Call at once for a split pipe or leak.
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