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Discussion Starter · #1 ·
I’m in the process of re-configuring my small master bathroom 5’ x 8’ layout. I have a 1960's tri-level house and it has the old cast iron waste lines. I have two back to back bathrooms on the 2nd floor, with a back to back toilet and back to back sink, the shower is tied in with the sinks (see pic 1). I would like put a tub in the toilet location and move the toilet to where the sink is (see pic 2). There is a 10 inch soffit so I would not have to cut any floor joists downstairs.

I need some suggestings, for the most cost efficient ways to rough in the new layout (e.g. will the existing line layout work (red lines), with minor changes or do I need to replace the entire backend). I’m already spending a lot of the budget in moving walls. I will greatly appreciate any help.

Thanks
 

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Do you have access to the pipes from below? Some disruption of the adjacent bath may occur--

Have you opened up the walls yet? Any pictures of the plumbing? The toilets Might be joined like Siamese twins--a X fitting not individual Ts.

More info needed.
 

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Discussion Starter · #3 ·
I have access to the pipes from below only. I have gutted the bathroom yet. There are only three tie in to the lines and 1 4'' vent to vent all fixture in both bathroom except the bathtub.
 

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Looks like you can move those---You will need to learn about chain breakers (Pipe snappers)

That is a tool for breaking/cutting cast iron drains--They can be rented.

You will be replacing that with PVC---I think that both toilet openings will need to be changed--

Those fitting are so close together that removing only one might not be practical.

Post a couple more pictures ----a little wider--we need to see the beginning of the run and the end.---Mike---
 

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If the area below the bath renovation is living space, I would not use PVC for the plumbing changes. You will see a noticeably increase in the sound level.
I would replace with cast iron like the existing. I know it will be more expensive and you may not be able to DIY, but for the noise level it will be money well spent.

If not living space below, ignore this.
 

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Discussion Starter · #6 ·
Here is a couple more pic. The wastelines drops vertically down 8 feet to the basement where there is a 1/2 bath. I really like to keep the bathtub drain line intact (useable). There is a vent about 3' from the toilet at the end of the run.
 

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That all looks like you should not have to much difficulty.

The back to back toilets will need work---but they look easy to reach----I think you will be able to do that job when the time comes.---Mike----
 
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