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 Tap into sewer pipe
Author: Livid Larry

I am putting a toilet in basement.Have 4" cast iron pipe under the concrete floor which I have to tap into. Which is the best way to go ?

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 Re: Tap into sewer pipe
Author: Dunbar (KY)

Tap into this line......make sure the toilet is vented and tied into an existing vent stack on the same level or you will have to take it up to the roof.


You cannot tie into an existing drain stack for venting reasons.

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 Re: Tap into sewer pipe
Author: hj (AZ)

It is not a matter of the best way. There is really only one way. You have to cut a piece out of the pipe and insert a proper fitting, then connect the basement plumbing to it. You also have to consider the proper venting for those fixtures.

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 Re: Tap into sewer pipe
Author: Livid Larry

This tap in will be approx. 3 feet from vertical stack. Will this take care of the venting?

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 Re: Tap into sewer pipe
Author: hj (AZ)

NO! The only thing that will take care of proper venting is a proper vent.

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 Re: Tap into sewer pipe
Author: HytechPlumber (LA)

If the stak you are referring to is the main sewer stak then you can tie in a tee into the stak below the slab. Then the line can run and catch your toilet with a wye and closet bend, then continue on and turn up with long sweep in your lavatory wall. The lav can be caught on this pipe (wetvent)and it will be your toilet vent and must either go thru the roof independently, or tie into existing vent on upper floor approx. 48" above floor level. Sometimes an added vent can be hidden in corner of locker. In my area a vent for a toilet must be 3", some areas allow 2". Some areas allow "vent cheks" or "studor vents" which I amm not very fond of, yet, it is a consumer option. GOOD LUCK

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