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The Curious Bag
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<h4 class="dechead">On One Hand: It's Advisable Whenever It Might Freeze
It is a good idea to leave faucets dripping whenever it gets so cold that the water in the pipes might freeze, especially if the temperature is expected to drop below 20 degrees F. Pipes burst because water expands as it freezes. When you leave it flowing, it provides plenty of room for the ice to expand into.
On the Other: Some Recommend Against It Altogether
Some experts object to wasting water by dripping faucets. The Houston, Texas, Public Works Department, for example, recommends that homeowners use thick layers of pipe insulation rather than dripping faucets to prevent freezing. It is known that in some situations dripping faucets can cause drain pipes to freeze up.
Bottom Line
It's best to take a proactive approach with your water pipes in cold weather. Pipe insulation is always recommended; however, unless the situation mitigates against it, it is also a good idea to leave your faucets dripping, so that there will be plenty of room for ice to expand in the pipes if they do freeze.
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