What actually freezes here
A pipe needs more than one cold night to freeze solid. It needs several hours of temperatures well below freezing, wind on an exposed spot, and water that is not moving. In this area that combination is rare but real, and the pipes that suffer are nearly always the same few.
Outdoor faucets with a hose left attached top the list. Next come pipes in unheated crawlspaces, garages and exterior walls, plus irrigation backflow assemblies and any supply line running through an uninsulated corner.
| Location | Risk | Protection |
|---|---|---|
| Outdoor hose bib | High if a hose stays on | Remove hose, cover or drain, close interior shutoff if there is one |
| Unheated crawlspace | Medium to high | Foam sleeves, sealed vents, keep access panel closed |
| Garage wall or ceiling pipes | Medium | Insulate, keep the door closed on cold nights |
| Exterior wall under a sink | Medium | Open cabinet doors to let room heat in |
| Irrigation backflow | High | Drain the system and wrap exposed parts |
| Water heater supply lines | Low to medium | Foam insulation on exposed runs |
Before the cold snap: a short checklist
- Disconnect and store every garden hose, then drain the faucet.
- Fit insulated covers over outdoor spigots, or close the interior valve that feeds them.
- Slip foam sleeves over exposed pipes in the crawlspace and garage, and tape the seams.
- Seal air leaks near pipes where wires or ducts pass through the wall.
- Know where your main shutoff is and check that it closes.
- Set the thermostat no lower than 55 degrees if you leave town.
Foam sleeves are cheap and quick, and they only work if the pipe is dry and clean. A pipe that already sweats or leaks needs repair first, not wrapping.
During a freeze: drip, open and keep warm
On the coldest night, let one faucet on the exposed side of the house drip, cold and hot. Moving water is much harder to freeze, and a drip also relieves the pressure that builds between ice and a closed faucet. It costs little compared with a split pipe.
Open cabinet doors on exterior walls so room air reaches the pipes. Keep the garage door closed and the crawlspace access panel in place. Leave interior heat on overnight even if the house is empty.
Step by step: thawing a frozen pipe safely
- Recognise it. A faucet that gives a trickle or nothing, frost on a pipe, or a bulge in the line all point to ice.
- Open the faucet. Leave it open so melting water and steam have somewhere to go.
- Find the frozen section. It is usually on an outside wall or in an unheated space. Feel along the pipe for the coldest spot.
- Warm it gently. Use a hair dryer on low, warm towels or a space heater placed safely away from anything flammable. Work from the faucet back toward the frozen section.
- Check for leaks as water returns. A pipe that cracked will start to leak as the ice melts. Close the main valve at once if it does.
Never use an open flame
No torch, no lighter, no heat gun held close. Flame can ignite insulation, wood framing and fumes, and it can overheat soldered joints so they fail later. Do not use a space heater on a wet floor or near stored paint.
If you cannot find the frozen section, cannot reach it, or the pipe is already split, stop. Call the 24/7 line.
After a freeze: look before you relax
A thawed pipe is not necessarily a sound pipe. Ice can crack a pipe in a place you cannot see, and the leak only shows when the water pressure returns. Walk the house after the thaw, check ceilings and the crawlspace, and watch the meter for movement with every fixture off.
If a pipe split, shut off the main, drain the line and call for a burst pipe repair. Photograph the damage for your insurer. Sudden damage like a burst pipe is often covered, while a slow leak often is not, so read your policy.
Pipes that freeze again and again, or runs that are old and brittle, may be better replaced than patched. A full or partial repiping job costs more up front, but it ends the repeat repairs where the pipe is the true problem.
Common mistakes
- Leaving the hose on the spigot because it never froze last year.
- Closing the crawlspace vents with a plastic tarp that traps moisture.
- Turning the heat off in a vacant house.
- Using a propane torch to speed up a thaw.
- Opening a frozen faucet and walking away.
- Ignoring a small stain that appears days after the thaw.
Cold nights in Mill Creek
Cold snaps happen on some winter nights here, not every year, so the risk is the exposed hose bib and the unheated crawlspace. Homes in the original plat built from 1976 through the early 1980s often have crawlspace runs and garage walls with thin insulation. Wrap those before November, not during the first frost.
Newer areas such as the Town Center and The Farm at Mill Creek were built to later practices, but exterior spigots are still exterior spigots. We also serve nearby towns including Bothell, and the same simple prep applies there.
Frozen pipe questions
At what temperature do pipes freeze?
Water freezes at 32 degrees Fahrenheit, but pipes inside walls and crawlspaces usually need several hours of sustained cold to freeze. Wind and exposure speed it up.
Should I leave faucets dripping all night?
On the coldest nights, yes, one faucet on the exposed side of the house. A thin steady drip is enough. It uses little water compared with the damage a split pipe causes.
Can I thaw a pipe with a hair dryer?
Yes, on a low setting, working slowly with the faucet open. Never use a flame, and stop if you see water seeping from the pipe.
Does insurance cover a burst pipe from freezing?
Sudden freeze damage is often covered, but policies differ. Read yours or ask your insurer, and photograph everything before cleanup.
Is a freeze really likely in Mill Creek, or am I overreacting?
Likely every year, no. Possible on some winter nights, yes. A few minutes of prep on hose bibs and crawlspace pipes costs very little compared with a water cleanup.