Frozen Pipes Thawed Safely and Burst Lines Repaired Fast

Water expands as it freezes. When ice forms inside a pipe, it blocks the line and pressure builds between the ice and a closed faucet. That pressure, not the ice itself, is usually what splits the pipe. The break often happens in a section that never froze, and it may not leak until the ice thaws and water begins flowing again.

Pipes most likely to freeze are those in exterior walls, unheated crawlspaces, garages, attics and basements with poor insulation. Kitchen sink lines on outside walls, supply lines to outdoor faucets and pipes near foundation vents are frequent trouble spots. Drafts matter as much as temperature. A small gap letting cold air reach a pipe can freeze it even when the rest of the house is warm.

Thawing and repairing a frozen pipe quickly limits damage. Understanding why it froze prevents the same problem next winter.

Open flames, propane torches and heaters placed close to pipes are responsible for house fires every winter. They can also overheat pipes, damage fittings and, in the case of plastic pipe, cause failure. Safe thawing uses gentle, controlled heat: warm air, heat lamps kept at a safe distance or specialized pipe-thawing equipment.

Thawing begins near the open faucet so melting water has somewhere to go, then moves toward the frozen section. This relieves pressure as the ice melts. When a frozen pipe is inside a wall, warming the room and opening cabinet doors can help, but walls sometimes need to be opened to reach the pipe. We explain any access needed before cutting anything.

Outdoor faucets are one of the most common sources of freeze damage. A standard hose bib holds water right at the exterior wall, where it freezes easily. A frost-proof sillcock places the valve inside the heated home, at the end of a long stem, so water drains from the exposed portion when the faucet is closed.

Frost-proof sillcocks only work when installed with a slight downward pitch and when hoses are disconnected in the fall. A hose left attached holds water in the stem, which can freeze and split the pipe inside the wall. When we replace a damaged outdoor faucet, we install a frost-proof model with the correct pitch and a vacuum breaker, and we explain seasonal steps that keep it working.

The best time to protect pipes is before winter, but it is never too late. Insulating exposed pipes in crawlspaces, garages and basements with properly fitted pipe insulation slows heat loss. Sealing gaps where cold air enters, such as around rim joists, foundation vents and pipe penetrations, often matters more than insulation alone.

For pipes that repeatedly freeze despite insulation, listed heat cable installed according to manufacturer instructions can keep them above freezing. In some cases, rerouting a pipe away from an exterior wall is the most reliable solution. During extreme cold, keeping the heat on, opening sink cabinets on exterior walls and letting vulnerable faucets drip slightly all help. Homes left empty in winter should have the heat maintained or the plumbing drained.