Unlike pressurized water supply lines, drain pipes are not always full of water. They freeze when water sits stagnant in a low spot or when the pipe has a shallow slope. Common culprits include:
2021 note: With more people working from home due to the pandemic, households are using more water irregularly. Strangely, less water flow at night (when everyone is asleep) allows drains to freeze solid by morning. how to unfreeze a drain pipe 2021
If you have tried these methods for an hour with no success, or if the frozen pipe is located inside a wall where you cannot access it, it is time to call a licensed plumber. Professionals use specialized equipment like pipe thawing machines (which use electrical currents to heat the pipe from the inside) or steam injection to clear blockages without destroying your drywall. Unlike pressurized water supply lines, drain pipes are
If you turned on your kitchen sink or took a shower only to watch water back up into the tub or hear gurgling sounds from the toilet, you may have a frozen drain pipe. Unlike supply pipes (which burst under pressure), drain pipes are gravity-fed, so a freeze stops drainage completely but is less likely to burst. However, the fix is trickier because you can’t just run hot water through a faucet. 2021 note: With more people working from home
Here is the proper, safe way to unfreeze a drain pipe in 2021.
If the above fail after 45 minutes, try this plumber’s trick:
Pipe Heating Cable (Retrofit type)