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Frozen Pipes and How to Prevent Them
Understanding frozen pipes and how to prevent them can help you avoid loss of water, plumbing repairs and serious water damage during winter. When temperatures fall, water inside vulnerable plumbing can freeze. As a result, pressure may build inside the pipe and eventually cause a crack or burst.
However, not every pipe in a home faces the same risk. Pipes near exterior walls, garages, crawl spaces, attics and other cold areas usually need the most attention. Therefore, checking these areas before extreme cold arrives can prevent a small problem from becoming an emergency.
Why Do Water Pipes Freeze?
Pipes freeze when the temperature around them becomes cold enough for the water inside to turn to ice. This often happens when plumbing lacks insulation or cold outdoor air reaches the pipe.
For example, a pipe may run through an exterior wall, beside an unsealed opening or through an unheated garage. Even though the rest of the home feels warm, that small area may become cold enough for the pipe to freeze.
Where Do Pipes Commonly Freeze?
First, check plumbing in areas that receive little heat. Common problem locations include:
- Pipes along exterior walls
- Garages
- Crawl spaces
- Attics
- Unheated basements
- Areas near foundation walls
- Outdoor faucets
- Pipes near windows and doors
In addition, the City of Toronto identifies pipes against exterior walls and the area where the water service enters the home as common locations for freezing.
Signs of a Frozen Pipe
A frozen pipe may not always look frozen from the outside. Instead, the first warning often appears when you turn on a faucet.
Watch for these signs:
- No water from a faucet
- Very little water flow
- Sudden low water pressure
- Problems that begin during extreme cold
- Frost on an exposed pipe
- Unusual plumbing sounds
If one part of the home loses water while other fixtures still work normally, a nearby pipe may have frozen.
Can a Frozen Pipe Burst?
Yes. A frozen pipe can crack or split as pressure builds inside the plumbing. However, you may not notice the leak until the ice begins to thaw and water starts flowing again.
Therefore, always inspect a frozen pipe carefully while it thaws. If you notice leaking, shut off the main water supply when it is safe and arrange repairs immediately.
How to Prevent Frozen Pipes During Winter
Insulate Vulnerable Pipes
One of the simplest ways to prevent freezing is to insulate exposed plumbing. Foam pipe covers can help reduce heat loss around pipes in garages, crawl spaces and other cold areas.
Most importantly, inspect the full length of the vulnerable pipe. Small exposed sections can still freeze during severe cold.
Seal Cold Air Leaks
Next, look for drafts around windows, doors, vents, electrical openings and places where pipes pass through walls. Cold air entering through a small opening can quickly lower the temperature around nearby plumbing.
Therefore, seal unwanted gaps where appropriate and keep cold air away from water lines.
Disconnect Outdoor Hoses
Outdoor faucets face direct exposure to freezing temperatures. Before winter, disconnect garden hoses and allow exterior plumbing to drain when your system permits it.
If your home has an indoor shutoff valve for the outdoor faucet, close it before freezing weather and drain the remaining water from the line.
Keep Garage Doors Closed
If plumbing runs through the garage, keep the garage door closed as much as possible during cold weather. In addition, insulate exposed garage pipes and check for drafts around doors and walls.
Let Warm Air Reach Plumbing
During extreme cold, open cabinet doors below sinks when plumbing runs against an exterior wall. This allows warm room air to circulate around the pipes.
The City of Toronto frozen pipe guide also recommends keeping areas around plumbing warm, closing garage doors and opening kitchen, bathroom and laundry cabinets during very cold weather.
Know Your Main Water Shutoff Valve
Knowing where your main shutoff valve is located can make a major difference if a frozen pipe breaks. Therefore, locate it before winter and make sure you can reach it quickly.
In many Toronto homes, the valve sits in the basement near the foundation wall where the water service enters the property.
Take Extra Care When Leaving Home
If you travel during winter, keep enough heat in the home to protect the plumbing. Also, consider asking someone to check the property while you are away.
For longer absences, some homeowners may choose to shut off the main water supply and drain the plumbing. However, make sure that approach suits your home’s heating and plumbing systems before doing so.
Consider Leak Detection
Water sensors can provide an early warning if plumbing begins leaking. For example, place sensors near water heaters, laundry rooms, mechanical rooms and areas where pipes have frozen before.
Some systems can also work with automatic shutoff valves. As a result, they may help reduce water damage when nobody is home.
What to Do When a Pipe Freezes
Open a Faucet First
If you suspect a frozen pipe, open a nearby faucet. This gives water and pressure somewhere to move as the ice starts to melt.
Apply Gentle Heat
If you can safely locate the frozen area, gradually warm it. The City of Toronto lists options such as a hair dryer, electric heating pad, warm towel or warm surrounding air.
Never use a torch or open flame to thaw a frozen pipe. Open flames can create a serious fire hazard. Also, never leave electrical heating equipment unattended.
Check for Cracks While the Pipe Thaws
Meanwhile, watch the pipe and surrounding area carefully. A crack may not become obvious until water begins flowing again.
If you notice a leak, turn off the main water supply when safe and contact a licensed plumber.
Call a Plumber if You Cannot Find the Frozen Area
If you cannot locate or safely thaw the pipe, professional help may be the safer option. GTA Restoration provides emergency plumbing services in Toronto for frozen, leaking and burst pipes.
What if the Pipe Has Already Burst?
First, shut off the main water supply when you can do so safely. Next, arrange the plumbing repair. Then remove standing water and begin drying wet building materials.
A burst pipe can send water behind drywall, below flooring and into ceilings. Therefore, visible cleanup alone may not be enough.
Our water damage restoration team can assist with water extraction, moisture checks and structural drying after a pipe failure.
Check for Hidden Moisture
Water can travel beyond the area where the pipe broke. For example, moisture may enter insulation, wall cavities, flooring and nearby rooms.
If you are unsure how far the water travelled, water leak detection and moisture readings can help identify affected materials.
Prevent the Same Pipe From Freezing Again
After the immediate problem is fixed, determine why the pipe froze. Perhaps insulation was missing, a draft reached the plumbing or the area did not receive enough heat.
Correcting the cause is important because the same section may freeze again during the next cold period.
Ultimately, learning about frozen pipes and how to prevent them comes down to preparation. Insulate vulnerable plumbing, stop cold drafts, keep cold areas warm, disconnect outdoor hoses and know where your main water shutoff is located.
In addition, inspect problem areas whenever temperatures drop sharply. These steps make frozen pipes and how to prevent them easier to manage before a plumbing emergency develops.
When homeowners understand frozen pipes and how to prevent them, they can respond earlier and reduce the chance of serious winter water damage.
Frozen Pipe or No Water During Cold Weather?
GTA Restoration provides emergency plumbing, frozen pipe response, water extraction and structural drying throughout Toronto and the GTA.
If a pipe is leaking or has burst, shut off the water when safe and act quickly before moisture spreads farther.
Learn More
How to Prevent Burst Pipes from Freezing in Winter | How to Prevent Frozen Pipes from Bursting in the Winter | House Winter Water Damage and How to Prevent It | Burst Pipe Plumber | Burst Pipe Montreal Frozen Pipe 
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