My laundry wall lands DIRECTLY on top of an I joist in my basement. They are parallel so moving one side or another will not allow me to miss the I Joist. There is no method to vent up because a truss lands directly on top of this wall. This means I need to go down, and have to drill a 4" round hole through my I Joist top flange and probably 1/3 of the I-Joist web.
I know this basically ruins the joist. BUT I will not be touching the bottom flange. In addition, I have a wall that is partially below this I Joist, meaning in the basement I have probably 2" of flange bearing on this wall which is parallel with the joist.
Right now all I can think of is: Attach a 4' long 2x4 or 2x6 on the side of the top plate & studs of my basement wall to ensure 100% of the joist bottom flange is making contact with the wall for about 2' on each side of what would be the weakened area. I would also ensure there is contact to this wall at all points with shims if needed (Basement wall is not there as load bearing, so it may be 1/8" shy of making contact with the I Joist flange right now).
I would create an X brace for the top flange to bear load on both joists next to it but I have plumbing on both sides! This also means I can't just run another I Joist or 2x12 near the weakened joist. I am not sure how much load bears on each flange but I would assume 45% of weight is on the top and 45% on the bottom with 10% or less in the webbing.