A burst pipe can flood your home with hundreds of litres of water per minute. That water destroys drywall, warps flooring, and creates mould conditions within 24 to 48 hours. Knowing exactly what to do before an emergency plumber arrives makes the difference between a quick cleanup and a costly rebuild.
Most Canadian homeowners do not know where their main water shut-off valve is located. According to the Insurance Bureau of Canada, water damage is the single largest cause of home insurance claims in Canada. Burst pipes account for a significant portion of those claims, especially during winter months when temperatures drop below minus 20 degrees Celsius in cities like Calgary, Edmonton, and even parts of the Lower Mainland.
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This guide walks you through the immediate steps to take when a pipe bursts, how to shut off your water supply, when professional help is essential, and how to prevent burst pipes from happening in the first place. If your home was built between 1978 and 1997, your plumbing may be especially vulnerable. Homes with Poly B plumbing face a higher risk of sudden pipe failure and should take extra precautions.
Steps to Take When a Pipe Bursts
The first 30 minutes after a pipe bursts are critical. Water spreads fast, and every minute of delay increases the damage. Follow these steps in order to protect your home and your family.
Turn Off the Water Supply Immediately
Locate your main shut-off valve and close it right away. This single action stops the flow of water and prevents further damage. Most main valves are located near the water meter, in the basement, or in a utility closet. If you cannot find the valve, call your local water utility for guidance.
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Some homes have secondary shut-off valves for individual fixtures. If the burst pipe is behind a toilet or under a sink, you can close the local valve instead. This lets you keep water running to the rest of the house while you manage the emergency.
Turn Off Electricity in the Affected Area
Water and electricity are a dangerous combination. If the burst pipe is near any electrical outlets, appliances, or your electrical panel, go to your breaker box and switch off the power to that section of the house. Do not step into standing water near electrical sources.
Document the Damage for Insurance
Before you start cleaning up, take photos and videos of the water damage. Capture the burst pipe, the standing water, and any affected belongings. Your insurance company will need this evidence to process your claim. The Canadian Mortgage and Housing Corporation recommends documenting all damage before any repairs begin.
Remove Standing Water
Use towels, mops, and a wet-dry vacuum to remove as much standing water as possible. Open windows and run fans to start drying the area. The faster you remove the water, the lower your risk of mould growth and structural damage.
How to Shut Off Your Water Main
Every homeowner should know how to shut off their water main before an emergency happens. A pipe can burst at any time, and fumbling through your basement in a panic is not the ideal way to learn.
Find Your Main Shut-Off Valve
In most Canadian homes, the main shut-off valve is located where the water line enters the house. Check near the water meter, which is usually in the basement, crawlspace, or utility room. The valve is typically a round wheel handle or a straight lever handle.
If you live in a condo or townhome, the main shut-off valve may be in a shared utility room. Contact your property manager or strata council if you are unsure where to find it. For homeowners in multi-unit buildings, the shared plumbing infrastructure adds complexity, and a professional inspection is often the safest approach.
Turn the Valve Clockwise to Close
For wheel-style valves, turn the handle clockwise until it stops. For lever-style valves, turn the lever so it is perpendicular to the pipe. Do not force the valve. Older valves can become stiff, and excessive force may cause the valve to break, creating an even bigger problem.
After closing the valve, open a faucet on the lowest level of your home to drain any remaining water from the pipes. This relieves pressure and reduces the risk of further leaks.
Test Your Valve Regularly
Make a habit of testing your main shut-off valve every six months. Turn it off and on to ensure it moves freely. If the valve is stiff or difficult to turn, contact a licensed plumber to replace it before an emergency occurs.
When to Call an Emergency Plumber
Not every plumbing issue requires an emergency call, but a burst pipe almost always does. A burst pipe can release up to 100 litres of water per minute, which is enough to cause severe damage in a short amount of time.
Situations That Require Immediate Professional Help
You should call an emergency plumber right away if the burst pipe is inside a wall, under a concrete slab, or in any location you cannot access. You also need immediate help if the water shut-off valve is broken or if the pipe continues to leak after you close it. If you smell gas or suspect electrical damage, leave the house immediately and call emergency services before contacting a plumber.
Homes with aging Poly B plumbing should treat every leak as an emergency. Poly B pipes degrade from the inside out, which means a small leak today can signal a system-wide failure tomorrow. If your home has Poly B and you experience a leak, a full pipe assessment is the safest course of action.
What to Expect When the Plumber Arrives
A qualified emergency plumber will first assess the source of the burst and stop any remaining water flow. They will then inspect the surrounding area for structural damage, check for electrical hazards, and recommend the best repair approach. For homes with older plumbing, the plumber may recommend a full system evaluation to prevent future failures.
At Urban Piping, our team has completed over 28,000 Poly B replacement projects across Western Canada. We offer same-day emergency assessments and provide detailed repair estimates so you know exactly what to expect. If your home needs repiping, we handle everything from the plumbing work to drywall repair and paint restoration. Get a free estimate and protect your home from further damage.
Temporary Fixes for a Burst Pipe
While you wait for a professional plumber to arrive, you can take a few temporary measures to minimize water damage. These fixes are not permanent solutions, but they can buy you valuable time.
Apply a Pipe Repair Clamp
A pipe repair clamp is a simple device that wraps around the damaged section of pipe and tightens to seal the leak. You can find these at any hardware store. Make sure you select the correct size for your pipe. Clean and dry the area around the burst before applying the clamp for the best seal.
Use Epoxy Putty
Plumbing epoxy putty is a mouldable compound that hardens to seal leaks. Knead the putty until it is uniformly coloured, then press it firmly over the burst area. Most epoxy putties set within 20 to 30 minutes and can withstand normal water pressure. This is a good option for small cracks and pinhole leaks.
Wrap with Rubber and a Hose Clamp
For larger bursts, cut a piece of rubber from an old inner tube or a rubber glove. Wrap it tightly around the damaged section and secure it with a hose clamp or heavy-duty zip ties. This creates a temporary barrier that slows or stops the leak until a plumber can make a permanent repair.
Open Faucets to Relieve Pressure
After shutting off the main valve, open all faucets in your home. This drains the remaining water from the pipes and relieves any residual pressure. Lower pressure reduces the stress on the damaged section and may slow the leak.
Why Poly B Pipes Are More Prone to Bursting
Poly B plumbing was installed in an estimated 700,000 Canadian homes between 1978 and 1997. This grey plastic piping was once considered an affordable and easy-to-install alternative to copper. Over time, however, Poly B proved to be highly unreliable.
The chlorine in municipal water supplies reacts with the polybutylene material, causing the pipes to become brittle from the inside. Hairline cracks develop at the fittings and connections, which can suddenly split open without warning. Unlike copper or PEX piping, Poly B shows very few external signs of deterioration before it fails.
According to the Canadian Mortgage and Housing Corporation, homes built during the Poly B era are now reaching the age where failure rates spike dramatically. If your home is 25 to 40 years old and still has its original plumbing, a professional assessment is strongly recommended.
Homeowners with Poly B should review our detailed guides on insurance coverage for Poly B pipes and creating a Poly B risk management plan. Many insurance providers now require Poly B replacement as a condition of coverage, and proactively replacing your plumbing protects both your home and your ability to file future claims.
How to Winterize Your Pipes to Prevent Bursts
Freezing temperatures are the leading cause of burst pipes in Canada. When water inside a pipe freezes, it expands and creates enormous pressure, up to 2,000 pounds per square inch. No pipe material can withstand that pressure indefinitely.
Insulate Exposed Pipes
Pipes in unheated areas like basements, garages, crawlspaces, and exterior walls are the most vulnerable to freezing. Wrap these pipes with foam insulation sleeves, which are inexpensive and available at any building supply store. Pay special attention to pipes near exterior walls and in the attic.
Seal Air Leaks Around Pipes
Cold air drafts can accelerate pipe freezing. Check for gaps around pipes where they enter or exit your home, especially near foundation walls and rim joists. Use caulk or spray foam to seal these gaps and keep cold air out.
Keep Your Home Heated During Cold Snaps
Set your thermostat to at least 16 degrees Celsius, even when you are away from home. This minimum temperature keeps the air inside your walls warm enough to prevent pipe freezing. If you are travelling during winter, ask a neighbour to check your home periodically.
Let Faucets Drip During Extreme Cold
When temperatures drop below minus 25 degrees Celsius, let a small stream of water run from one or two faucets. Moving water is less likely to freeze, and the slight pressure relief reduces stress on your pipes. Focus on faucets connected to pipes along exterior walls.
Know Your Pipe Material
If your home has Poly B plumbing, winterization alone is not enough. The material itself is failing regardless of temperature. Homes in Calgary, Edmonton, and Vancouver with Poly B should schedule a professional inspection and replacement before the next freeze cycle begins. Urban Piping serves all three cities and offers Poly B replacement in Calgary, Edmonton, and Vancouver with a 25-year warranty on every project.
Protect Your Home With Professional Plumbing Assessment
A burst pipe is one of the most destructive plumbing emergencies a homeowner can face. Acting quickly, shutting off the water, and calling a qualified emergency plumber are the three most important steps you can take to minimize damage.
If your home was built between 1978 and 1997 and still has its original plumbing, you are living on borrowed time. Poly B pipes fail without warning, and the damage they cause goes far beyond the pipe itself. Water destroys drywall, flooring, insulation, and personal belongings. Mould growth can begin within 48 hours and creates long-term health risks.
Urban Piping has been Canada’s trusted Poly B replacement company since 2008. Our certified team has completed over 28,000 projects and provides complete remediation, including drywall repair and paint restoration. Every project comes with a 25-year warranty and a fixed price with no hidden fees.
Get a free estimate today and take the first step toward protecting your home from a plumbing emergency. Our team serves homeowners in Calgary, Edmonton, Vancouver, and surrounding areas across Western Canada.
