I'm renovating my kitchen which used to have soffits. We've pulled out all the soffits and framing of the soffits.
The vent stack for my sink goes up the wall and comes out of the wall just before the top plate - then it goes into the ceiling where it runs in between two joists. The wall is an exterior 2x4 wall.
If you saw it from the side it would look something like this:
I'm wondering - can I reduce that 2" vent to 1.5" vent and drill through the top plate and feed the 1.5" PVC through and then enlarge it back to 2" inside the ceiling?
I'm thinking something like this:
Is that possible? Are there any other safe ways to get that vent through that top plate and into the ceiling?? This would be in the state of IL if that matters.