The short answer
Exterior Walls and Unheated Spaces
Water pipes running inside exterior walls lose heat rapidly to the cold outdoors. The wall cavity often has minimal insulation around the pipes themselves. Similarly, pipes in unheated attics, basements, and crawl spaces are directly exposed to freezing air temperatures. These locations typically get the coldest, making them the first places ice blocks form inside the pipe.
A garage is another common trouble spot, especially if it lacks heating or insulation. The water heater or washing machine supply lines there are often forgotten until they burst. If you live in Oklahoma City, check these areas before a hard freeze. A quick inspection of visible pipes can help you identify the most vulnerable sections in your home.
Outdoor Faucets and Swimming Pool Lines
Outdoor faucets, or hose bibbs, are directly exposed and freeze very quickly. The pipe segment inside the wall behind the faucet is also at high risk. Always disconnect garden hoses before winter and consider installing frost-proof faucets or insulated covers. A small amount of trapped water in these fixtures can expand and cause a split.
Underground irrigation and swimming pool supply lines are highly susceptible. They are often shallow and not buried below the frost line. You must drain these systems thoroughly before cold weather. Not winterizing pool pipes and sprinkler lines is a common cause of outdoor water damage when temperatures drop sharply.
- Hose bibbs on the home's exterior.
- The interior pipe behind an outdoor faucet.
- Lawn irrigation system pipes and backflow preventers.
- Above-ground pool plumbing and filters.
- In-ground pool supply and return lines.
- Decorative outdoor fountains or pond plumbing.
Kitchen and Bathroom Vulnerabilities
Pipes under sinks, especially in kitchens or bathrooms on an outside wall, are prone to freezing. Cabinets enclose these pipes, trapping cold air from the exterior wall and blocking warmth from the room. During a freeze warning, leaving cabinet doors open allows warmer indoor air to circulate around the pipes. This simple step can prevent a major leak.
Toilet supply lines, particularly in a guest bathroom or basement that is used infrequently, are also a risk. Stagnant water in these lines freezes more easily than water in frequently used pipes. Letting a small trickle of water run from faucets on cold nights keeps water moving, which significantly lowers the freezing point inside your plumbing system.
What Happens When a Pipe Freezes
Water expands by about nine percent when it freezes. This expansion creates tremendous pressure inside a copper, PVC, or PEX pipe. The ice blockage itself is not the main problem; the pressure buildup between the ice and a closed faucet is. This pressure will find the weakest point, often causing the pipe to burst or a fitting to fail.
The rupture may not happen at the exact spot of the ice blockage. It can occur elsewhere in the pressurized section. When the ice later thaws, water flows freely from the break, leading to flooding. The leak can go unnoticed for hours if it's inside a wall or ceiling, causing extensive water damage to structure and belongings.
Immediate Steps After Discovering a Burst Pipe
Your first action must be to stop the water flow. Locate your home's main water shutoff valve and turn it off immediately. This valve is usually where the main water line enters your house, often in a basement, crawl space, or garage. If you cannot find it, call a plumber for emergency assistance to prevent further flooding.
Once the water is off, you can address the water damage. Move furniture and belongings out of the wet area if it is safe to do so. Soak up standing water with towels. Then, contact local water damage pros for structural drying. They use industrial equipment to remove moisture from walls and floors, which helps prevent mold growth.
- Shut off the main water supply to the house.
- Turn off the water heater's power or gas supply.
- Open faucets to drain remaining water from pipes.
- Remove valuable items and furniture from the wet area.
- Start removing excess water with a mop or wet vacuum.
- Contact a qualified plumber to repair the broken pipe.
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Call Now (405) 565-9833Frequently asked questions
At what temperature do pipes freeze?
Pipes can freeze when outside temperatures reach 20 degrees Fahrenheit or lower, especially if they are exposed. However, a strong, sustained wind can cause pipes in vulnerable spots to freeze at higher temperatures, around the mid-20s. Insulation and indoor heating are your best defenses against this risk.
How can I prevent my pipes from freezing?
Insulate exposed pipes in attics, crawl spaces, and garages with foam sleeves. Seal cracks and openings in exterior walls where cold air enters. On very cold nights, let a small trickle of water run from faucets supplied by vulnerable pipes. Keep your home's thermostat set to at least 55 degrees, even if you are away.
What should I do if a pipe is frozen but hasn't burst?
Keep the faucet open to allow water to flow as the ice melts. Apply gentle heat to the frozen section using a hair dryer, heating pad, or towels soaked in warm water. Never use an open flame or a blowtorch. If you cannot locate the freeze or thaw it, call a plumber for help.