Additional floor joists under jacks.

This is the floor joist between the dining and living rooms.  Originally, it was just 2 joists with 1 1/2 inches between them.  One of them was very nearly cut through to make way for the pipe.  I put a joist between the 2 existing joists then added a couple more.  They are supported on both ends by the main floor supports.

When the plumbing was installed they very nearly cut through the floor and ceiling joists. This is where I’ve installed a new pier so I added joists.