JB
Verified by
Jean-François Beaulieu
RBQ Certified Master Plumber
✓ 18 years experience in Quebec
Why do pipes freeze?
Water expands as it freezes, creating significant pressure inside pipes. This pressure can exceed the strength of metal or plastic, causing a burst. The most vulnerable pipes are those passing through unheated spaces: exterior walls, garages, crawl spaces and uninsulated basements.
At-risk pipes in Quebec
- Pipes in poorly insulated exterior walls
- Water lines in unheated garages
- Pipes in crawl spaces
- Outdoor faucet supply lines
- Water meters in cold basements
Prevention before severe cold
- Insulate exposed pipes with tubular foam insulation
- Install heat cables on at-risk lines
- Close and drain exterior faucets before winter
- Maintain a minimum temperature of 15°C throughout the house, even during extended absences
Plumbing Price Table — Quebec
Indicative price ranges for the Montreal area. Rates may vary by city, complexity and contractor.
| Service | Min | Max |
|---|---|---|
| Broken frozen pipe repair | $200 | $800 |
| Basement pipe insulation (professional) | $150 | $400 |
| Heat cable installation | $200 | $600 |
| Emergency thawing + repair | $300 | $1,200 |
Indicative ranges compiled by UrgencePlomberieQC.com, July 2026.
Frequently Asked Questions
At what temperature do pipes risk freezing?
Pipes begin to risk freezing when outdoor temperatures drop below -6°C for extended periods. Pipes in unheated spaces can freeze even at temperatures slightly above 0°C if insulation is absent.
Does my insurance cover damage from a burst frozen pipe?
Generally yes. Water damage from burst frozen pipes is covered by most home insurance policies if the home was properly heated. A home left without heat in winter may be excluded from coverage.
How do I effectively insulate at-risk pipes?
Polyethylene tubular foam is the simplest solution. It cuts easily and installs in minutes. For very cold areas, electric heat cables offer superior protection.
Should I let a trickle of water run during extreme cold?
This technique can prevent freezing by keeping water moving. It's most useful for at-risk pipes (outdoor faucets, pipes in exterior walls). However, it wastes water — preventive insulation is preferable.
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