Frozen Pipes in Toronto: Prevention, Safe Thawing, and Repair Options
Toronto frozen pipes are most common in exterior walls, unheated garages, and uninsulated crawlspaces during cold snaps below -15°C. Safe thawing: open the faucet, apply gentle heat, never use open flame. Call a plumber if the pipe has burst or you can't locate the freeze.
Published February 25, 2026 · Last updated April 26, 2026
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Introduction
Toronto winters reliably produce sub-zero stretches that freeze pipes in vulnerable locations — exterior walls, unheated garages, uninsulated crawlspaces, hose-bib spigots. The good news: most frozen pipes can be safely thawed without burst. The bad news: a frozen pipe that bursts when it thaws is one of the leading causes of mid-winter water-damage claims in Toronto. This guide covers prevention before the cold snap, safe thawing during, and when to call a licensed plumber.
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Every job Tornado Plumbing & Drains completes in Toronto and the GTA — repair, install, replacement, drain work, sewer work, fixture work — is backed by a 25-year workmanship warranty. The written terms are provided with every quote. If our work fails within 25 years of the install date, we come back and make it right.
Quick answer
Frozen pipes in Toronto are most common in exterior walls, unheated garages, and uninsulated crawlspaces during cold snaps below -15°C. Prevention: insulate exposed pipes, keep heat above 13°C in unfinished spaces, drip cold faucets during cold snaps, disconnect outdoor hose-bib supplies in fall. Safe thawing: open the affected faucet, apply gentle heat (hair dryer, heat tape), never an open flame. Call a plumber if the pipe has burst or you can't locate the freeze. A 1/8″ frozen-pipe split releases 950+ litres per day at typical home pressure once thawed.
Toronto frozen pipe facts
Pipes typically freeze at -7°C ambient or colder, depending on insulation and exposure.
A 1/8″ frozen-pipe split releases 950+ litres per day at typical home pressure once thawed.
Frozen-pipe burst-and-thaw is the leading cause of mid-winter burst-pipe insurance claims in Toronto (IBC data).
Heat tape (UL-listed) is safe and effective for known-vulnerable pipes; foam pipe insulation handles the rest.
Outdoor hose-bib freeze-up is one of the most common causes — disconnect the hose in the fall and use a frost-free hose bib for permanent fix.
Open-flame thawing (propane torches) is the leading cause of attic and wall fires from amateur thawing — never use it.
Tornado dispatches frozen-pipe thawing same-day and after-hours during Toronto cold snaps.
DIY thaw vs call
DIY thaw is fine when
Pipe is accessible (visible, can apply heat directly). Freeze is at a known location (specific faucet not running). Pipe hasn't burst (no water dripping or visible damage). You're comfortable with the heat-source instructions.
Call when
Pipe has burst or shows signs of splitting (water dripping, ice expansion). Freeze is in a wall or behind drywall (need pro to locate without damage). You can't find the source of the no-water condition. Multiple pipes are frozen simultaneously.
What we bring
Thawing equipment (heat coil, hot water lines, thermal imaging to locate the freeze), pipe replacement materials, valve isolation tools. Most frozen-pipe calls are 1–2 hours total — locate, thaw, repair if burst, restore service.
Where Toronto pipes freeze most often
Toronto's housing stock has known freeze-vulnerable spots: north-wall kitchen sinks (cabinet against an exterior wall), unheated mudroom and garage supply lines, hose-bib spigots that weren't disconnected in fall, basement laundry tubs against exterior walls, and crawlspace runs in older homes without insulation. Cold snaps below -15°C are when these freeze; longer cold periods (multi-day) are when even normally-warm pipes freeze. Pre-winter prevention (foam insulation, heat tape on known-vulnerable runs, hose-bib disconnect) is meaningfully cheaper than emergency thawing or burst repair. Frost-free hose bibs are the permanent fix for outdoor freeze risk.
Sources cited in this guide
Where to go next
When the situation in this guide already matches what we cover, Frozen Pipe Thawing & Repair is the page where you book the visit and see the full scope, pricing, and warranty.
Thawing is the emergency; preventing the next freeze is the engineering. The Plumbing Repairs & Installations category covers pipe insulation, repiping vulnerable runs, and outdoor faucet replacement so the pattern doesn't repeat.
After the first-response steps
If you have a frozen line right now, Frozen Pipe Thawing & Repair is the booking page — safe thawing same day. If the same line keeps freezing winter after winter, Pipe Repair & Repiping is where the permanent fix lives.
Common questions
When should I call rather than wait it out?
Active leaks, sewage backup, no-water situations, and any flooding event are calls to make right away. The longer you wait, the more drywall, flooring, and finishes get pulled into the repair scope. Same-day and after-hours dispatch is standard across Toronto and the GTA.
What can I do before you arrive?
Shut the main water valve if you can find it, move valuables off the floor in the affected area, and take a few photos for your insurance file. If it's sewage, keep people and pets out of the affected room. We'll talk you through it on the dispatch call.
Is the work warrantied?
Yes. Every job we complete is backed by a 25-year workmanship warranty. The written terms are provided with the quote. If our work fails within 25 years of the install date, we come back and make it right.
Are you licensed in Toronto?
Yes — Master plumber T95-4969603, Plumbing contractor T94-4992639, Drain contractor T87-4722944, Building renovator T85-4728632, Plumbing license FI6216638. Tornado has been serving Toronto and the GTA since 2016 with over 1,200 completed jobs.
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