Can a Pipe Freeze and Crack Without Bursting Right Away?

As water inside a pipe freezes, it expands. This expansion puts immense pressure on the pipe walls from the inside. If the pressure is enough, the metal or plastic can develop a small, longitudinal crack. The ice itself often acts as a temporary plug, sitting in the crack and preventing an immediate flood.

This phenomenon is sometimes called a 'frost crack'. The damage is done, but the leak is delayed. The pipe is compromised and will fail once temperatures rise. This is why a home may seem fine during a cold snap, only to have a leak appear during a thaw.

Knowing the warning signs can help you catch a problem before a major leak occurs. Some signs point to a pipe that is currently frozen, while others indicate a crack has already formed and is leaking. Acting on these clues quickly can limit the amount of water damage to your home.

If you suspect a frozen pipe, you can cautiously try to thaw it using a hair dryer or towels soaked in warm water. Never use an open flame. If you see any signs of an active leak, your first step should be to shut off the main water supply to the house to stop the flow.

• A specific faucet yields no water when turned on.
• You see frost forming on the exterior of a visible pipe.
• You notice an unusual smell coming from a drain or faucet.
• You hear strange clanking, banging, or creaking noises in the walls.
• A section of drywall or ceiling develops a damp spot or a bulge.
• Your water meter continues to run when all water fixtures are off.

Prevention is the most effective strategy. Insulate pipes in unheated areas like attics, garages, and crawl spaces. During cold nights, let a trickle of water run from faucets served by vulnerable pipes. Keep your home's thermostat set to at least 55 degrees Fahrenheit, even when you are away, to maintain warmth in the walls.