Said It Here

Where do I run the vent for a washer installation?

Routing the plumbing vent incorrectly or using the wrong fitting can render the washer vent completely useless. Using the proper fitting, such as swapping out an improper sweep for a sanitary tee, ensures the drainage and venting system works correctly without failing code or causing backups.

What people tried

Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.

  1. 1
    Draining through the floor, adding a santee to the trap, and continuing the vent through the attic or roof.
  2. 2
    Using an AAV (Air Admittance Valve)
  3. 3
    Swapping out the long sweep for a regular sanitary tee
  4. 4
    Flipping the trap around

In their words

Unedited, most upvoted first, each linked to the thread it came from.

“Oh yeah. That's all wrong.”source ↗

schannoman · r/Plumbing · 2 upvotes

“Wrong tee makes the vent useless.”source ↗

openlyobese · r/Plumbing · 2 upvotes

“Swap out the long sweep for a regular sanitary tee”source ↗

OkAstronomer5469 · r/Plumbing · 2 upvotes

“I’m doing a small addition, moving my washer into the new construction, and I’m not sure where to run the vent.”source ↗

B0sk087 · r/Plumbing · 1 upvotes

Where this came up

r/Plumbingappliance installationhome improvementpipesplumbingventing

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