Preventing Frozen Pipes in Winter
Why Pipes Freeze and Burst
Water expands as it freezes, and that expansion can crack pipes from the inside, especially in pipes running through unheated spaces like attics, crawl spaces, and exterior walls.
Prevention Steps
Insulate exposed pipes in unheated areas, and disconnect and drain outdoor hoses before the first hard freeze.
During extreme cold snaps, allowing a slow drip from faucets on exposed lines can relieve pressure buildup, and keeping cabinet doors open under sinks on exterior walls allows warm air to reach the pipes.
What to Do If a Pipe Freezes
If you suspect a frozen pipe, shut off the main water valve if there are any signs of a leak, and avoid using open flame to thaw pipes. A licensed plumber can safely thaw the line and inspect for cracks before you turn the water back on.
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Frequently Asked Questions
At what temperature do pipes start to freeze?
Pipes become at risk when temperatures drop below approximately 20°F (-6°C) for an extended period, especially in poorly insulated areas.
Should I leave a faucet dripping during a freeze warning?
A slow drip can relieve pressure in exposed pipes and reduce the risk of a burst, particularly on lines that run through unheated spaces.