Slow Leaks: A dripping faucet can send a constant, tiny trickle of water into the drain that freezes layer by layer until the pipe is blocked. Signs Your Drain is Frozen The tub won't drain at all after a bath or shower. You hear gurgling sounds coming from the drain.
Even if you are away, keep your thermostat set to at least 55°F. Open vanity cabinet doors to let warm room air circulate around the plumbing. can a bathtub drain freeze