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Prevention

Frozen pipe prevention, Wasatch edition

Every January we pump out the same five failures. Every one of them was preventable in October. Here’s the whole playbook.

Updated July 2026 · 5 min read · Written by the Highwater field team

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Where pipes actually freeze

Not randomly. Freezes happen where plumbing meets cold air with no heat exchange: exterior walls, unheated spaces, and anywhere air leaks onto a line. Canyon-mouth and Wasatch Back homes hit freezing conditions the valley floor never sees. If you’re in Cottonwood Heights, Park City, or Heber, read this list twice. Roof ice is its own problem, see the ice dam prevention guide.

Exterior-wall plumbing

Kitchen and bath lines in outside walls, the #1 freeze site. Insulate the cavity or open cabinets on cold nights.

Unheated chases & garages

Lines through garages, attics, rim joists, and cantilevered floors freeze first. Foam sleeves are cheap; heat tape where sleeves can’t reach.

Hose bibs

Disconnect hoses by Halloween, a connected hose traps water that freezes back into the wall. Frost-free bibs fail too when hoses stay on.

Vacant rooms & second homes

Closed doors and setback thermostats create cold pockets. Keep interior doors open and the whole envelope at 55°F minimum.

The fall checklist (one afternoon, before Thanksgiving)

Not sure your setup survives a cold snap? Ask, free

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Cold-snap night moves (below ~15°F)

Open cabinet doors on plumbing walls. Let the faucet farthest from the meter run a pencil-lead drip, moving water resists freezing and relieves pressure if ice forms. Keep the garage door closed, interior doors open, and don’t set the thermostat back that night. All free, all effective.

If a pipe freezes anyway

No torches, ever. Shut water to that line (or the main), open the served faucet, and warm the area gently, hair dryer, space heater at a distance. Freezing often splits pipe that only leaks on thaw, so watch it and have a plumber check. If it’s already burst: the burst pipe page has the full protocol, and the number at the top of this page has a human on it.

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FAQ

Related questions

What temperature should I keep an empty house at?
55°F minimum, whole envelope, interior doors open, plus someone physically checking weekly. Below that you’re betting the furnace never hiccups on the coldest night. Full winterization is the safer call for long vacancies.
How much should the faucet drip?
A steady drip to pencil-lead stream from the faucet farthest from where water enters the house, cold side at minimum, both sides if the night is brutal. Pennies of water against a five-figure loss.
Is heat tape safe to leave plugged in?
Modern thermostatic tape, installed per instructions and inspected annually, yes. Replace anything cracked, kinked, or older than you can remember buying, aging tape is both a freeze and a fire risk.
Keep reading

Go deeper

GuideVacant & second homes: the risk timelineServiceBurst & frozen pipe cleanupGuideWhat to do first in a water emergency
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