Master Bath Remodel - need some help

Thanks guys,

I am now in Mississippi and live in the county so they follow 2012 IPC. The bath I am wanting to remodel is on the second floor.

In smallbath01 it shows the original plumbing with a vanity drain on the left, toilet in middle and tub on the right, the master bath never had a shower. The lines show where the plumbing is hidden by the floor.

I would like to move the toilet to the other side of the room about 10' away and add a shower on that side as well. In the second attachment I was thinking of moving the vanity plumbing into the wall to tie in to the main stack, then the yellow shows the 3" continuing to the toilet across the room, and the green shows where the tubs plumbing will be extended.

In the third attachment you can see the yellow 3" for the toilet, then the blue showing where the shower drain 2" will come in.

The fourth shows the shower location and the line in red is a proposed 2" vent. Currently the only vent at all is the main stack.

The fifth attachment shows the proposed path of the 2" vent going back across top of the room to tie in to the main stack.

If you see anything I may have missed don't hesitate to point it out but my main question is does that plan make sense, and instead of venting the shower and toilet individually can I vent them using the single 2" shown in red. Also what I can't quite figure out is what I will need to do where the shower, toilet and vent tie in.

Thanks in advance...
tim

Some one hacked up your original install. Glad your cutting it out. Your under IPC code. Attach the lavatory as drawn. Remove all sanitary tees not installed in a vertical position.

You will need a wall for the shower vent. You cannot vent anything under the floor. All vents must rise vertical {Up and down} at least 6 inches above the highest flood level rim (the toilet} prior to turning horizontal.

You will need 3 by 2 wye for the shower and a wall to run under before you pick up the trap. There is no fitting as you have it drawn. You must use a long sweep 90 on the toilet 3 inch when turning horizontal to horizontal or a st 45 and reg. 45 fitting (same thing). From toilet toilet flange 3 inch st. 90 long sweep 90 then 3 by 2 wye with a vent on the shower. This is called a wet vent. You will need permits and inspections if your locality require this.

If you have any more S type traps in your house you should plan on redoing them they all are illegal.

Also don't forget to perm cap that unused 2 inch. Use a scd 40 cap. Make sure you use primer and glue on all joints. Scd 40 white PVC only No mixing of plastics.

All your floor joist your running the 3 inch for the toilet through will need to be beefed up.

I only kiss a plumber if hes better looking than my wife...

Okay I think I have this laid out like I need.

I have the 2" shower p-trap going under shower wall with a 2x2 wye and 45 for vent, then going on to a 3x2 wye to connect to 3" from toilet.

From toilet a 3" flange to a 3" closet bend to a 3x2 wye (slightly rotated) for vent to run back behind toilet and up toilet wall, vent will use 45's until above in ceiling