Homeowner Guide

Frozen Pipes: What to Do

If a tap won’t run in freezing weather, a pipe has probably frozen. Keep the tap open, find the cold section, and warm it gently. Never use an open flame. If the pipe has split, shut off your main water valve and call a plumber.

How to Tell If a Pipe Is Frozen

Frozen pipes usually show up on the coldest mornings. Common signs:

  • Little or no water from one tap, while other taps still run
  • Only the hot or only the cold side stops working
  • Frost on a pipe you can see
  • A pipe that looks bulged or cracked

Pipes in exterior walls, unheated rooms, garages and basements freeze first. Check those areas before anywhere else.

Ontario Pacific Plumbing service van parked outside a home
Step by Step

What to Do When a Pipe Freezes

Open the Tap

Leave the faucet open. As the ice melts, running water helps clear the rest and relieves pressure in the pipe.

Warm the Pipe Gently

Use a hair dryer, heating pad or space heater, starting near the tap and moving toward the frozen section. Never use an open flame or a torch.

Watch for Leaks

As water starts to flow, check the pipe for drips. If it has split, shut off your main water valve and call a plumber.

How to Prevent Frozen Pipes

A few habits lower the risk through an Ontario winter:

Keep the Heat On

Keep your home heated, including when you are away for a few days.

Open Cabinet Doors

Open sink cabinets on exterior walls so warm air can reach the pipes.

Let a Tap Drip

On the coldest nights, a slow drip from a tap on an exterior wall keeps water moving.

Insulate Exposed Pipes

Add foam pipe insulation to pipes in unheated areas such as garages, crawl spaces and cold basements.

Close Outdoor Taps for Winter

Shut the indoor valve that feeds each outdoor tap and drain the line before the first hard freeze.

Water spraying from a burst underground pipe fitting
FAQ

Frequently Asked Questions

They can once temperatures rise, but the longer a pipe stays frozen, the greater the chance it splits. Keep the tap open and warm the pipe gently rather than waiting.
There is no single temperature. The risk rises when it stays well below freezing for hours, especially for pipes in exterior walls, garages or unheated rooms, and when the heat is turned down.
A slow drip from a tap on an exterior wall helps on the coldest nights. On a single-handle faucet, set the handle to the middle so water moves through both lines.
Avoid chemical drain cleaners, and don’t pour boiling water into plastic pipes. Warm water can help a slightly frozen drain. If the drain stays blocked, call a plumber.
Call if you can’t find the frozen section, it’s inside a wall or ceiling, the whole house has no water, or a pipe has cracked or is leaking.
Yes. Ontario Pacific Plumbing answers calls 24/7 in King City, Vaughan, Bradford, Newmarket and nearby areas.
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Pipe Frozen or Leaking? We Can Help

If you can’t find the frozen section, it’s inside a wall, or a pipe has split, call us. Our phones are answered 24/7. See our frozen and burst pipe repair service.