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Author:
2oldhouse2 (MI)
Hello, I have an old farmhouse build in the early 1900's in Michigan. The cast iron dwv goes thru a cobblestone foundation and has a vent just outside the foundation that extends a couple of feet above the ground and on to the septic tank. I want to install a dwv that goes through the roof. My question is this, do I need to remove the outside vent, for this dwv system to meet code? If so, can I use a rubber femco coupling to transition to PVC? How do these rubber couplings hold up underground? How long to they last?
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Author:
Pipe runner (AZ)
Yes, you can use shielded rubber couplings underground to transition to go from CI to PVC. How did you plan to cut the CI pipe?
I'm thinking that is a clean-out outside your foundation wall not a vent but I'm not familiar with how 1900 plumbing was done. Normally the cleanout is ran just high enough to match the grade.
DWV (drains, waste, vents). Once you are outside of the home heading to the septic you are now talking about a building sewer.
Are there any vents within the building penetrating the roof? What is happening to led you have decide to run anew vent?
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Author:
2oldhouse2 (MI)
We just bought this house as is, no inspections, knowing it needs major updating. No, there are no vents through the roof. There is sewer smell inside the house -in the bathroom, and the basement. Someone did install PVC 4" PVC/DWV but it branches horizonally at a slope. From everything I've read and researched, I've not found any examples that represent this type of application - typically the soil stack runs vertically and branches off of the soil stack. The outside vent is definity not a clean-out, it has a rounded dome - not a removable cap. You can smell the septic if you get close enough. There is also a sure vent off of the bathroom sink (in the basement). The smell could just be an old non-effective wax ring.
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Author:
hj (AZ)
Just "adding a vent" to the main underground piping SELDOM has any benefits. Vents have to be installed WHERE they are needed, not were it is easy to connect them.
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Author:
Wheelchair (IL)
I would suggest.... having a licensed plumber perform an onsite inspection and evaluation of your house plumbing system. What ever you pay them... will be worth it.
Best Wishes
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Author:
2oldhouse2 (MI)
Thank you all for your suggestions. I have since uncovered a lot information from contractors and plumbers. Yes, this was a common method over a century ago. I'm running a new dwv from the outside of the house, through the foundation and up two stories through the roof.
Edited 1 times.
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Author:
hj (AZ)
Probably just "busy work" that will NOT do anything to solve any problems you may have.
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