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Here is why your tub drain freezes, why it’s dangerous, and how to thaw it out before you end up with a costly repair. We tend to think of our plumbing as existing entirely inside the warm envelope of our home. But the bathtub drain is a trickster.
Unlike your kitchen sink, which usually drops straight down into a heated crawlspace or cabinet, a bathtub drain runs horizontally for a few feet before connecting to the vertical stack. Often, this horizontal run is located just a few inches below the floor—or worse, inside an uninsulated exterior wall or a poorly sealed subfloor. bathtub drain freezing
The thin layer of organic sludge that lines your drain acts like a sponge. It holds moisture against the pipe wall. When freezing starts, that sludge creates a rough surface for ice crystals to latch onto. Within a few hours of your morning shower, a partial blockage can turn into a full ice dam. A frozen tub drain isn't just an inconvenience—it can be a disaster. When you run water to try to melt the ice, the water has nowhere to go. It backs up into the tub. Here is why your tub drain freezes, why