Frozen Shower: Drain Pipe
Set up a small space heater in the crawl space directed toward the pipes (ensure it is a safe distance from any flammable materials). 4. Plunger Power
After thawing, immediately insulate or heat the vulnerable area: frozen shower drain pipe
| Problem | Solution | |---------|----------| | Pipe in exterior wall | Open cabinet doors (if sink nearby), add spray foam insulation, or reroute pipe. | | Pipe in uninsulated crawlspace | Wrap with foam pipe insulation + heat tape (thermostat-controlled). | | P-trap freezes | Pour ½ cup of RV antifreeze (propylene glycol – safe for drains) into the shower after each use in extreme cold. | | Cold draft through drain | Plug the drain with a silicone drain cover when not in use. | Set up a small space heater in the
Unlike supply lines (the pipes that bring water to your faucet), drain pipes aren't always full of water. However, the —the U-shaped bend beneath your shower—is designed to hold a small amount of water at all times to block sewer gases from entering your home. | | Pipe in uninsulated crawlspace | Wrap
Because this water sits still, it is the first point of failure when temperatures drop. If your shower is located above an uninsulated crawl space or sits against an outer wall with poor insulation, that trapped water can easily turn into a solid ice plug. How to Tell if the Drain is Frozen (vs. Clogged)
If you can access the pipe (basement, crawlspace), feel for the coldest spot.
It may seem counterintuitive; after all, you run hot water down the drain every day. However, shower drains are particularly susceptible to freezing for several reasons: