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rhys 11-29-2011 02:50 PM

Extending Basement Plumbing
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I am in the middle of adding a shower to my basement bathroom. In order to make things fit I want to extend existing plumbing for toilet and vanity by about 5ft. I have cut the concrete floor and found all my plumbing, including my vent stack for the basement fixtures. My problem is, I can't see where everything connects without tearing up most of my floor. It looks like everything angles towards the main drain and must all connect somewhere under the floor. I have included a sketch showing rough layout.

My question is, is it ok to add this distance to existing lines without changing the venting location?

The existing vanity has a sub-floor p-trap that I would use for the shower. As I understand there are restriction for venting distance from traps that I assume are met now, so I don't want to change that. I think I can live with the 5ft of pipe before the ptrap and whatever smells may come from there (it will just make me clean my shower more frequently).

Thanks for any advice in this matter.

rhys 12-09-2011 07:19 AM

Well hopefully this is alright cause I have already done it
I poured about 10 gallons of water from a bucket down each pipe separately and listened for any signs of suction and didn't notice anything.

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