Adding a bathroom to my basement and had to move the drain for the shower. The pipe under the cement is cast iron so I am trying not to have to cut it. The Iron pipe has a trap right under where the old drain was, it now needs to be about 18 inches away. Was thinking about how to move it and came up with something that keeps the pipe low but now I'm not sure it will work. I'm going to try to attach a really poor paint drawing that I did. If it doesn't work I'll try to explain.

I went up from the old trap and did a 180 back down. Now a 90 in the direction of the new drain and another 90 back up. This puts most of the pipe deep but will I have a drainage problem?

Thanks,

Brad

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Originally Posted by Bmug

Adding a bathroom to my basement and had to move the drain for the shower. The pipe under the cement is cast iron so I am trying not to have to cut it. The Iron pipe has a trap right under where the old drain was, it now needs to be about 18 inches away. Was thinking about how to move it and came up with something that keeps the pipe low but now I'm not sure it will work. I'm going to try to attach a really poor paint drawing that I did. If it doesn't work I'll try to explain.

I went up from the old trap and did a 180 back down. Now a 90 in the direction of the new drain and another 90 back up. This puts most of the pipe deep but will I have a drainage problem?

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It won't work.

You'll have to cut off the old trap and extend the trap arm (the horizontal portion going into the trap).

You can use a 'CP-200 Proflex band' to make the transition from cast-iron to plastic.

Also, the maximum developed length for a 2" trap-arm is five feet from where it takes off from the vent.

Hi Brad,

If you turn your drawing clockwise a quarter turn you'llseeen it resembles a "S". "S" traps are illegal in all codes in every state. In effect you have a unvented trap. Back to the drawing board. Sorry, Tom

Thanks, I thought you were going to say that it wouldn't work.

What is a 2" trap arm and how do I measure it for the 5 foot restriction?

Would this work? Picture Attached - but in words.

Do a 90 degree from the top of the old trap, over to the new drain about 18 inches and 90 degree up to the shower tub.

Really don't want to get into cutting the old pipe if possible. I've been told it's easy but just a little shy of trying that.

This is the same configuration only with a horizontal elbo added. Bite thebullet and move the trap. Shower drains clog up often enough with rotting hair and grease without helping it along with extra bends and outlawed trap. Good luck, Tom