Washing machine drain standpipe too short
A washing machine standpipe shorter than the required 18 to 24 inches will instantly spill high-volume washer discharge onto the floor. This severe height restriction between the p-trap and the drain opening risks major flooding and code violations that require immediate replumbing.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
Found another way around this?
Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.
- 1Having a contractor or plumber redo the drain pipe to meet the minimum height requirements.Did this help you?
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“This will instantly spill all your washer discharge onto the floor. The riser out of the ptrap needs to be 18" minimum, 24" in some places. Needs to be redone. Sooner is better.”source ↗
“I’m concerned with the distance from p-trap to washer box drain opening. I wanna say it’s maybe only 4”-6”. Would this cause me problems?”source ↗
Where this came up
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