Frozen Waste Pipe May 2026

On extreme "polar vortex" nights, run a tiny trickle of water through the fixture farthest from the street. Moving water takes much longer to freeze than standing water. However, remember that if the waste pipe is frozen, this will just fill your tub.

If your waste pipe runs through an unheated garage, attic, or crawlspace, wrap it in fiberglass insulation or foam pipe sleeves. frozen waste pipe

In many homes, a waste pipe freezes because cold air is blowing around the pipe. Check for holes in the siding or foundation where the pipe exits. Fill those gaps with spray foam. On extreme "polar vortex" nights, run a tiny

A frozen waste pipe is a race against the clock. Act fast, use gentle heat, and never let desperation drive you to a flame thrower. Stay warm, and good luck un-gunking those pipes If your waste pipe runs through an unheated

If you have PVC or ABS plastic pipes and you know exactly where the blockage is (usually an uninsulated exterior wall or a crawlspace), you can try to thaw it yourself.

If your kitchen waste pipe is in an exterior wall, open the cabinet doors underneath the sink on freezing nights to let warm house air circulate. When to Call a Pro If you have tried heat for two hours with zero success; if you have cast iron pipes; or if you cannot find the location of the freeze, call a plumber. They have steam machines and electric thawing equipment designed specifically for this. It will cost you a few hundred dollars, but that is significantly cheaper than replacing a burst pipe and remediating sewage damage.

Congratulations (or rather, condolences), you likely have a frozen waste pipe.