My house was built in the 1950s, I just finished gutting it so now I have a good look at all of the plumbing and it's a mess. Not sure if what I'm thinking of doing makes sense. For reference, it's a one story ranch with one bathroom. The plumbing is right over the drain that goes to the street.

Currently there is a galvanized vent stack with just the vanity draining to it. The toilet sits right on top of a tee:

[imgur.com]

The vent pipe is connected to the tee on the left side in the above photo; it drops down and has several 90 degree bends to get there:

[imgur.com]

To the right side of the tee is the p-trap from the shower drain.

My proposed solution to this is to cut the galvanized vent pipe half way up. Couple it to a 3" PVC with a shielded coupling. Redo the PVC line from the vanity and support the cored out 2x4s with strut shoes. The toilet will have to be connected with a closet bend but at the CB will need to be at an angle to attach to the vent stack. In between the two, I plan to connect the shower drain (so that the toilet is the lowest in the chain). This will all connect to the 4" main below with a long sweep + clean out. Like this:

[imgur.com]

I would move the vent stack to be closer to the stud on the right however I don't want to drill any additional holes in the header or sill, the plan is to just run the pipes through the existing holes without making any new ones (since I'm pretty sure this shouldn't have been cored out in 2x4s to begin with.

Any problems with this plan of attack?

the piping from the basin creates an 's' trap - add a revent or an aav - or change the tie in point to 'level'

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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

I thought about adding a revent but I really don't want to drill anymore additional holes in those studs (I think that wall may be load bearing). I think if I run a 1 1/4 pipe in between the two joists (so I don't have to drill another hole in two joists and put a stud shoe on it as well it should suffice. Something like this (revent alternative):

[www.bhg.com]

revent alternative - use the 'bay' next to the vent stack and tie the new tee(s) in with shielded couplings (ferncos)

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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

not sure I follow, if the line in yellow is the line you will cut to replace everything below, why can't you just raise the level of the sanitary tee so it's aligned with the lav trap arm coming from the left?

That's what I'm going to do. I'd add that extra bit of PVC in there. I think we're on the same page, I'm going to basically run a few feet of PVC (connected to the vent) then san-tee the horizontal basin drain. Then below that is the tub and toilet.



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Yea. Needless to say I wasn't very happy when I saw that. Then again the house has been fine like that for 70 years so who knows. I'm still going to stick those stud shoes on there.