Why freezing temperatures can turn your plumbing into a high-pressure weapon
In short: When water turns to ice, it expands by 9%. In a closed plumbing system, this expansion creates an exponential rise in pressure that can easily shatter your pipes and cause catastrophic flooding. This sudden increase in pressure is what ultimately causes the structural integrity of the pipe to fail.
The mechanics of a burst pipe are driven by a simple principle of physics: volume expansion. When water freezes, its volume increases by approximately 9%. In a closed system, such as a pipe that is not currently in use, this expanding ice has nowhere to go. As the ice grows, it displaces the remaining liquid water, causing the internal pressure to increase exponentially. If this pressure continues to build over a prolonged period of time, the structural integrity of the pipe will eventually fail, resulting in a burst.
The aftermath of a burst is often more damaging than the freeze itself. Once a pipe ruptures, water will pour out continuously until the main shutoff valve is closed. This creates a race against time to prevent significant water damage to the home. Experts like Richard Trethewey emphasize the importance of labeling the main water shutoff valve and ensuring every resident knows its location to mitigate potential disasters.
Prevention is significantly more cost-effective than repair. To keep pipes from freezing, homeowners can allow warmer air from the house to reach them by opening cabinet doors. Additionally, slightly opening the faucet furthest from the water main can help. By allowing a small, steady dribble of water, you relieve the pressure buildup that occurs when ice begins to form. For extra protection, applying pipe insulation, available at most home centers, can help maintain stable temperatures around vulnerable lines.
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Sources
- Summary by Intellect · source: How a Frozen Pipe Bursts | Ask This Old House
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