Last Updated on October 31, 2025
In Canada’s cold winters, pipes can freeze and burst, causing thousands in damage. To prevent frozen pipes, keep indoor temperatures consistent, insulate exposed lines, seal air leaks, and let faucets drip slightly during deep freezes. Outdoor faucets should always be shut off and drained before temperatures drop.
Why Pipes Freeze in Canadian Winters
When temperatures fall below 0°C, standing water in pipes begins to solidify. Because water expands when it freezes, pressure builds up inside the pipe until it bursts. Exposed plumbing in basements, crawl spaces, garages, and exterior walls are at highest risk.
Keep Indoor Temperatures Stable
- Maintain a minimum indoor temperature of 18°C even when away from home (recommended by the Insurance Bureau of Canada).
- Avoid turning the heat off overnight or when travelling.
- Open cabinet doors under sinks to allow warm air to circulate around supply lines.
(Source: Insurance Bureau of Canada)
Insulate Exposed or Vulnerable Pipes
- Use foam pipe sleeves or fibreglass insulation on lines in unheated areas.
- Pay special attention to pipes along exterior walls and in attics or crawl spaces.
- Wrap both hot and cold water lines — cold pipes can freeze faster.
(Reference: Government of Canada – Get Prepared Guide)
Seal Cracks and Drafts
Cold air entering through wall cracks or gaps near vents, cable lines, or foundation joints can rapidly drop pipe temperature.
- Use expanding foam or silicone caulking to close these openings.
- Weather-strip basement windows and around hose bibs.
Cost Impact : “Average repair cost for burst pipes in Canada ranges from $2,000–$5,000 (IBC).”
Let Faucets Drip During Extreme Cold
Allowing a slow, steady drip keeps water moving inside the line, reducing the chance of freezing. This is especially helpful for:
- Pipes running through exterior walls
- Lines near unheated garages or crawl spaces
Shut Off and Drain Outdoor Faucets
Before winter:
- Turn off the indoor shut-off valve leading to exterior taps.
- Open the outside tap to drain residual water.
- Disconnect hoses and store them indoors.
- If possible, install frost-proof hose bibs for long-term protection.
Add Heat Tape or Cables (for Extreme Conditions)
Electric heat tape or self-regulating cables can prevent freezing on pipes that can’t easily be insulated. Always follow manufacturer instructions and safety guidelines approved by the Canadian Standards Association (CSA).
What To Do If Pipes Freeze
- Shut off the main water supply immediately.
- Use a hair dryer or portable heater to warm the frozen area gently.
- Never use open flames.
- Call a licensed residential plumber if no water flows after thawing attempts or if you suspect a burst.
(Source: Canadian Red Cross – Winter Safety Tips)
Final Tip
Consistent heat, good insulation, and seasonal preparation are the best defenses against frozen pipes.
👉 Need help winter-proofing your plumbing?
Contact Select Plumbing and Heating — Mississauga’s trusted plumbing experts.
Q1: What temperature do pipes freeze in Canada?
Pipes can freeze when temperatures fall below 0°C, especially in uninsulated or unheated areas.
Q2: Should I let faucets drip to stop pipes from freezing?
Yes. A slow drip helps relieve pressure and keeps water moving during extreme cold.
Q3: How do I insulate water pipes for winter?
Wrap pipes with foam sleeves or fibreglass insulation and seal nearby drafts to keep heat inside.
Q4: Can I use a space heater to thaw frozen pipes?
You can use one safely if monitored, but never use open flames. Call a licensed plumber if unsure.
