I have a question here regarding my vent. As you can see in the pictures, there is the main vent (on the left) and another vent (for the shower) on the right.
This is currently installed with 45 degree adapters at the top, presumably so that they would not cut too much out of the top plate. Then a bulkhead was constructed to hide the pipe. I would like to get rid of the need of the bulkhead.
A few specifics: This is a non-load bearing wall. The top plate consists of a laminated 2×6 with another 2×6 and a 2×8. There would be approximately 2 inches left in the top plate at the site of the vents after notching out the 2x6s and the 2×8. In other words, there is 2 inches of space between the pipes and the wall.
The roof vent is about 20″ above the top plate.
What I’d like to do is remove the 45 degree adapters on both vents and instead go straight up through the top plate. I’d then (like it is now) bring the right vent horizontally over to the left vent, connect them in the attic like they are now (but recessed back a bit b/c I’ve gotten rid of the 45 degree angle on both), and then do a 45 degree angle near the attic vent in the roof.
I was concerned originally about cutting the top plates more than they are, yet I am unable to find anything that deals with this issue in non-load bearing walls. In Michigan, for LOAD-BEARING walls, I’ve been shown this:
To me then, this would appear that I can cut out a decent sized (greater than 50%) notch out of the top plate so long as I use a specific type of galvanized metal strap between the two sides. And that would be for a load bearing wall.
Does anyone see issue(s) with my plan? My other main concern is the venting and whether the final 45 degree adapter will still provide proper venting being so close to the vent in the roof.
Thanks for any advice!