4September 2026
A frozen pipe often starts as a small inconvenience: a faucet that only trickles, an ice-cold section of pipe, or no water at all at one fixture. In Prince George, where long cold spells can push vulnerable plumbing well below freezing, understanding why pipes freeze can help you act before a pipe bursts and causes expensive water damage.
The risk is not limited to older homes. Newer homes, rentals, garages, shops, and commercial properties can all have exposed or poorly protected plumbing. The difference usually comes down to where the pipe sits, how much heat reaches it, and whether water is moving through it.
Why Pipes Freeze When Temperatures Drop
Water expands as it turns to ice. Inside a pipe, that expansion creates pressure. The ice does not always have to form at the exact place where a pipe eventually splits. A blockage of ice can trap water between the frozen section and a closed faucet, allowing pressure to build until the pipe, fitting, valve, or connection fails.
A pipe is most likely to freeze when it is exposed to sustained cold and has little protection from the heated part of the building. Pipes in exterior walls, crawl spaces, unfinished basements, attics, garages, mechanical rooms, and under kitchen or bathroom cabinets are common trouble spots. Outdoor hose connections and water lines running near foundation walls also deserve attention.
The outside temperature matters, but wind, drafts, insulation gaps, and heat loss matter too. A pipe in a well-insulated basement may be fine during a cold snap, while a pipe behind an open gap in an exterior wall can freeze even when the thermostat is set comfortably.
Still Water Freezes Faster
Water that sits still in a pipe has time to lose heat. This is why a rarely used bathroom, vacant suite, storage area, or seasonal building can be at greater risk. Letting a vulnerable faucet run at a small trickle can help in severe cold because moving water is less likely to freeze and an open faucet gives pressure somewhere to go if ice begins forming.
A trickle is not a substitute for proper insulation or reliable heat. It is a short-term cold-weather precaution for a known problem area.
Heat May Not Reach the Pipe
Many homeowners assume that if the furnace is running, every pipe is protected. Unfortunately, heat does not always reach enclosed cavities, under-sink spaces, garages, or crawl spaces. Closing interior doors, shutting off supply vents, or lowering the thermostat substantially at night can leave a vulnerable line without enough warmth.
Kitchen and bathroom sink cabinets on exterior walls are a good example. The cabinet itself can block warm room air from reaching the plumbing. Opening those cabinet doors during extreme cold allows warm air to circulate around the pipes, especially overnight.
Areas Most Likely to Have Frozen Pipes
Every property is different, but certain locations repeatedly cause problems during a Prince George winter. Start by looking for plumbing located close to cold outdoor surfaces or outside the main heated envelope of the building.
Pay close attention to:
- Pipes in exterior walls, particularly below kitchen and bathroom sinks
- Water lines in unheated garages, crawl spaces, attics, additions, or utility rooms
- Outdoor taps, hose bibs, and irrigation lines that were not properly winterized
- Plumbing near open foundation vents, damaged insulation, or noticeable drafts
- Vacant units and seldom-used washrooms where heat is reduced or water is not used regularly
Commercial properties can have their own weak points. Warehouses, retail back rooms, janitor closets, staff washrooms, loading areas, and rooms with overhead doors may not stay as warm as the main occupied area. Property managers should not assume a central heating system protects every branch line equally.
How to Prevent Pipes From Freezing
Prevention is usually less costly and less disruptive than repairing a burst pipe. The best approach is to keep pipes warm, remove cold air leaks, and address recurring problem areas before the next deep freeze.
Keep the building heated consistently. If you are away, do not turn the thermostat down so far that cold areas of the building lose protection. The right setting depends on the property, insulation, and location of the plumbing, but maintaining steady indoor heat is safer than allowing repeated deep temperature drops.
Disconnect garden hoses before winter and shut off the interior supply to exterior taps when your plumbing setup allows it. Drain the exterior line after closing the valve. A hose left connected can trap water at the tap and contribute to a freeze inside the wall.
Insulate accessible pipes in unheated or drafty areas with pipe insulation rated for the application. Insulation slows heat loss, but it does not create heat. For a pipe that freezes repeatedly, a plumber may recommend a more complete solution, such as sealing a draft, rerouting the line, improving insulation around the cavity, or installing approved heat cable where appropriate.
During periods of extreme cold, open cabinet doors beneath sinks on exterior walls and keep interior doors open enough for heat to circulate. If you know a particular faucet has frozen before, let it run at a slow, steady trickle until temperatures improve. Use both hot and cold sides if they are supplied by separate vulnerable lines.
For landlords and commercial property operators, prevention also requires clear responsibilities. Confirm that tenants know who to call after hours, identify water shutoff locations, and inspect vacant spaces regularly during cold weather. A frozen pipe found early may only require thawing. A burst pipe found days later can damage flooring, drywall, inventory, and neighboring units.
What to Do If You Suspect a Pipe Is Frozen
A faucet that stops flowing during freezing weather should be treated as a warning sign. First, check whether other fixtures have water. If only one faucet is affected, the freeze may be in that branch line. If several fixtures are affected, the problem could be more widespread or related to the main supply.
Keep the affected faucet open. If the ice begins to thaw, water needs a path to flow out. Then inspect visible plumbing for bulges, frost, dampness, dripping, or signs of cracking. If you see water leaking, shut off the main water supply immediately if it is safe to do so, then call for plumbing service.
Never use an open flame, propane torch, or other high-heat method to thaw a pipe. This can damage plumbing, ignite nearby materials, and turn a manageable issue into an emergency. A hair dryer on a low setting or gentle heat from the room may be suitable only for a clearly visible, accessible pipe with no leak present. Start near the faucet and work back toward the suspected frozen section. Do not attempt to thaw hidden pipes inside walls or ceilings yourself.
If you cannot locate the freeze, the pipe is inaccessible, or there is any evidence of a crack, it is time to bring in a professional. A plumber can assess the line, thaw it safely when possible, repair failed sections, and identify why that area became vulnerable in the first place.
When a Frozen Pipe Becomes a Plumbing Emergency
A frozen pipe becomes urgent when it bursts, leaks, or prevents essential water service. Water may not appear immediately because the pipe can remain blocked by ice. Once temperatures rise, a split pipe can begin leaking quickly. That is why it is wise to inspect the area again during the thaw.
Watch for wet drywall, water stains, a musty smell, pooling water, reduced pressure, or the sound of water moving where it should not be. If a leak is active, shut off the main water supply, move belongings away from the area, and contact a plumber promptly. If water is near electrical outlets, panels, or appliances, avoid the area and take appropriate safety precautions.
At RZ Plumbing Ltd., the goal is not just to repair the visible damage. A proper diagnosis should also address the source of the freeze, whether that is an unheated space, poor insulation, a draft, or a plumbing layout that needs attention. That helps reduce the chance of facing the same issue during the next cold spell.
A little preparation before temperatures drop can protect your home or property from a much larger repair. If a pipe has frozen before, do not wait for the next hard freeze to find out whether the problem is still there. Have the area assessed while it is accessible, dry, and easier to repair.