After removing the sub floor in my bathroom in order to extend the sewer pipe for the toilet (it's too close to the tank-side wall), I found that the floor joists have extremely large holes cut in them to make way for the plumbing.
What are my options for reinforcing them? I don't think I could do a sister joist both because of the plumbing running through the joist and because the joist runs quite a ways through the floor of my second story, and adding a sister joist would involve taking up a ton of the floor.
Should I brace it with steel bridging? I'm concerned about the potential vertical load.
What options do I have?
The room is approx 74" by 105" (the 105" runs in the same direction as the joists, it appears that the joists are at least that long, but may extend beneath other rooms)
Joists are 15/8 inches wide, 71/2 inches tall.
There is a 1st floor bathroom below. There is a tub in the 1st floor bathroom bordered by 3 walls – one of these walls runs perpendicular to the joists 4 feet away from the wall shown on the right in the first picture below.