Relocating a toilet upstairs - plumbing question


Old 02-25-08, 09:02 PM
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Relocating a toilet upstairs - plumbing question

I'm relocating a toilet on the upstairs floor of my house. I have a toilet downstairs in my basement. Because I'm relocating the upstairs toilet, I have to relocate the connection into the main sewer pipe below ground as well.

The question I have is how mush distance should there be between the two connections in the main? It's an old 4" cast iron pipe and the connections going into the main from the toilets are going to be ABS. What size pipe should I use for the new pipes from the toilet into the main?

Thanks in advance.
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Old 02-26-08, 03:53 PM
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If you're adding/moving a toilet upstairs - you can tie into the main stack anywhere. Be advised, cutting/tying into Cast can be a booger. It's heavy and not DIY friendly - more of an advanced project.

You need a minimum 3inch pipe to drain the new toilet into the existing main stack - and a 2inch vent off of the toilet as well.

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