I have purchased an old home and doing all renovation myself. Currently 2 baths, but moving one bath too totally new location. I can handle the water supplies no problem. The problem is with the toilet plumbing. The home is built above grade in Florida. The main sewer line is cast iron. Both current toilets are cast iron stacks into the main with the showers also tee'd into those stacks. The new bath will be beyond the end of the last bath on the line. I will not be using the first toilet on the line, but will be converting that bath to a laundry room. How do I add the new bath stack to the main line? Is this way beyond a major DIY'er? I am replumbing all the hot and cold through the home and changing the hot water heater to a whole house tankless.

Thanks
Todd

Todd, this project might be close to the limits for many a DIYer. If you are extending the run to a new toilet location you must be sure that you can still maintain the slope/pitch needed to drain properly. For every foot you add to that length you need 1/4" of addiitonl slop. How much furrther will the new toilet be from the old?

From the floor down the main is approx 30 inches. Tha bathroom not being used is approx 25 feet away from new location. Would it be helpful, or is it possible to post pics on this sight?

So you will need an additional 6 1/4" of slope. When you say "main" are you talking about the existing drain running away from the old toilet? How much space between that pipe and the underside of the floor joist?

Under the home is a approx 6" cast iron pipe going out to sewer connection at street. I am just getting into the plumbing of this home so excuse what I know and don't know. The two baths currently have large cast drops going down from the floor to the main 6" pipe. In those drops is also a 2-3" connection for the shower/tub and the sinks to drain into those drops. I would like to send you a sketch, but can't attach it. email me if it is possible and I will send you the sketch. EMAIL="[email protected]"][email protected][/EMAIL]

Click on my name and you will be given an option for a personal message or e-mail. You can also click on GO ADVANCED below the answer box, then manage files to downlaod a picture or anything from your computer. Tom Speedball1, or Milo, MGD and Mark may have better rough in answers to add.

I know it's a rough sketch, but let me know if it helps.

Greetings from Sarasota! Sorry Tod, We posted at the same time

Quote:

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home is built above grade in Florida.

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I assume we're talking crawl space here?
If you can get the main over to the new location the drainage should go down like this. This configuration only uses one vent for the entire group.
The toilet will connect to the main. The lavatory to connect to the toilet drain line and vent to the roof. The tub/shower to connect to the lavatory drain line and be wet vented by it as will the toilet. Or the tub/shower will run a dedicated vent and revent back to the stack at least 6" over the lavatrory flood rim. The lavatory will arm off the stack. Be advised to always check local codes before changing or remodeling your drainage system.

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