Every winter, the same calls come in: a pipe froze overnight during a cold snap, then burst when it thawed, and the homeowner woke up to water pouring through a ceiling. It's one of the most destructive — and most preventable — types of water damage we see in Denver. The Front Range is notorious for temperature swings, where a mild afternoon can plunge well below freezing overnight, and that's exactly when pipes fail.
Why Denver Pipes Are Especially Vulnerable
Denver homes face a particular combination of risks. Many older homes in neighborhoods across the city have plumbing running through uninsulated exterior walls, crawlspaces, or additions that were never properly winterized. Even newer homes can have vulnerable spots: hose bibs on exterior walls, pipes in unheated garages, and supply lines to kitchen sinks on outside walls. Add Denver's habit of dramatic overnight temperature drops, and pipes that were fine for weeks can freeze in a single night.
The cruel twist: pipes usually don't burst while frozen. They burst when the ice thaws. The frozen section creates pressure between the ice blockage and a closed faucet, and when the water starts moving again, that pressure splits the pipe. So the damage often shows up hours after the coldest part of the night — sometimes while you're at work.
Which Pipes Freeze First?
Know your weak points before winter arrives:
- Exterior-wall plumbing: Kitchen and bathroom pipes on outside walls are the number-one freeze location.
- Crawlspaces and attics: Unconditioned spaces where pipes get no benefit from your furnace.
- Garages: Especially water lines to hose bibs or laundry areas in unheated garages.
- Hose bibs and outdoor spigots: The classic burst point — water trapped in the line freezes and cracks the pipe inside the wall.
- Vacation homes and unused rooms: Any space where the heat gets turned down or off.
Prevention Steps That Actually Work
Do these before the first hard freeze, and you'll eliminate most of the risk:
- Insulate exposed pipes in crawlspaces, attics, garages, and along exterior walls with foam pipe sleeves. It's cheap and it works.
- Disconnect garden hoses from outdoor spigots in the fall, drain the line, and shut off the interior valve to the hose bib if you have one.
- Keep the heat on — never below the mid-50s — even when you're away. The money you save turning the furnace off is nothing compared to a burst pipe.
- Open cabinet doors under sinks on exterior walls during cold snaps so warm air reaches the pipes.
- Let faucets drip slightly on the coldest nights. Moving water is much harder to freeze, and it relieves the pressure buildup that causes bursts.
- Seal air leaks where cold air blows directly on pipes — gaps around dryer vents, electrical wiring, and where pipes pass through walls.
- Know where your main shutoff is and make sure everyone in the household can find it in the dark. If a pipe does burst, fast shutoff is the difference between a mop-up and a major burst pipe water damage repair.
What to Do During an Extreme Cold Snap
When the forecast shows single digits or below, take it seriously even if your pipes have never frozen before. Keep the thermostat steady day and night — the "setback at night to save energy" habit is exactly wrong during extreme cold. Open those cabinet doors, drip the vulnerable faucets, and check on any rarely used rooms. If you're leaving town, don't turn the heat off; ask someone to check the house, or shut off the main water and drain the lines if you'll be gone for an extended stretch in deep winter.
If a Pipe Bursts: Act Immediately
You'll know — water spraying or pouring where it shouldn't be, a sudden drop in water pressure, or water stains spreading fast. Here's the order:
- Shut off the main water immediately. Then open faucets to drain remaining water from the lines.
- Shut off electricity to affected areas if water is near outlets or the panel.
- Call for help right away. Burst pipes release enormous volumes of water fast — this is a job for frozen pipe damage cleanup professionals with extraction equipment, not towels and a mop.
- Document the damage with photos and video for your insurance claim while you wait.
- Call a plumber to repair the burst section — the restoration crew handles the water damage; the plumber fixes the pipe itself.
Don't wait until morning. Water from a burst pipe soaks drywall, insulation, flooring, and framing within hours. If it happens overnight, call our 24/7 line — we'll connect you with a Denver provider who can start extraction right away, even at 3 a.m.
Frequently Asked Questions
At what temperature do pipes freeze?
There's no magic number — it depends on insulation, exposure, and duration. But when overnight lows drop into the teens or single digits, unprotected pipes are at real risk, especially if the cold lasts more than a few hours.
Should I drip hot or cold faucets?
Drip the cold-water faucets on vulnerable lines. Some people drip both; the key is keeping water moving through the pipes most likely to freeze.
Will my homeowners insurance cover a burst pipe?
Sudden pipe bursts are typically covered under standard homeowners policies, but damage from pipes you failed to maintain or heat can be disputed. Check your policy, and document everything if it happens.