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Field sheet · winter lines

Frozen Pipe Thawing in North York

A tap that gives a trickle on a bitter morning is a frozen pipe warning. Thawing it safely, before it splits, saves a lot of damage.

  • Leaks traced before walls are opened
  • Smallest possible opening cut
  • New joints pressure-tested
  • Shut-off shown so you can find it again
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  • North York, Thornhill, Richmond Hill

Signs a pipe is frozen

  • One fixture giving nothing, or a thin dribble, in deep cold
  • Frost on an exposed pipe in a basement or crawl space
  • A toilet that will not refill
  • Odd smells from a drain, as air cannot move past an ice plug

What to do while you wait

Leave the affected tap open so melting water can flow and relieve pressure. Open cabinet doors to let warm air reach the pipes. Raise the thermostat a little. Gentle heat, such as a hair dryer kept moving, is fine on accessible pipe. Never apply a flame or torch, and never leave a space heater unattended near walls or flooring.

If the pipe has already split, thawing it will start a leak. Know where your main valve is before you begin warming anything.

How we thaw lines

We locate the frozen section by checking which fixtures work and feeling for cold spots. Accessible pipe is warmed gradually with controlled heat. For lines inside walls or underground, we may use specialized thawing equipment. Once water flows, we check for splits along the frozen length and repair as needed.

Why it happens in North York

Older bungalows and side-splits often have kitchen supply lines on exterior walls, under-insulated rim joists and hose bib lines that pass through cold cavities. Additions over crawl spaces are another common culprit. Extended cold periods with wind make those weak spots fail. Our winter pipe guide covers prevention, and winterizing outdoor faucets covers hose bibs.

Preventing a repeat

After thawing we look at why that pipe froze: missing insulation, a draft through a gap in the siding, or a pipe that could be rerouted inside the heated envelope. Small fixes often stop the problem for good. If a pipe did split, see burst pipe repair.

Questions we get about this

Is my water service from the street frozen?

If no fixture in the house has water, the service line or meter area may be frozen. Call us, and also check with the city, which may have advice during extreme cold.

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