How do you vent a bathroom that isn't vented?
Remodeling a half bath often reveals that the room lacks proper venting, turning a simple surface upgrade into a major structural issue down to the studs. Homeowners find themselves forced to route new vent lines through attics or modify framing just to meet code requirements.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
- 1Routing vents through the attic and up through the roof
- 2Connecting plumbing and venting to an adjacent room's wall
- 3Using unshielded couplings underground or guessing vent placement locations before inspection.
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“The previous set up people stated the shower would not be vented. There was a toilet where the shower drain is going. I had to cut/drill out a 45 elbow to get back to a straight pipe.”source ↗
“I went into the project to replace baseboards and now the room is down the studs. This half bath is not vented.”source ↗
“The contractor today said we could make a vent into the attic off the laundry and connect that to the sink and move the toilet to also be on that wall.”source ↗
Where this came up
People with this problem also raised
- 5How to figure out a master bathroom layout with tight space
- 3How to clear heavy bathroom steam without an exhaust fan
- 4How to vent a relocated plumbing sink or drain
- 2Should I retrofit a bathroom exhaust fan or replace the whole unit?
- 8How to clean a really mouldy rental shower and fix the caulk
- 2Converting a bathtub to a shower with a 1 1/4 inch drain