Correcting Existing Waste Water Drain Setup

vegan_vicky

Relevant background info: 200 year old stone farmhouse in PA. Built into a hillside so the first floor is also the basement. At the rear of the house, the second floor is ground level. The main soil pipe exits the center rear of the house between the second floor joists. Adjacent to that is a 1.5” copper drain line that also exits the house and I assume joins the main pipe in the ground beneath the concrete pad behind the house. There is a 1.5”...

Originally asked by CutterComp on Stack Exchange (diy) (CC BY-SA 4.0).

uphilltech

Great question — answering as the UphillTech team:

It looks like the transition from plastic to copper (the rubber coupling) is misaligned, with the plastic pipe being below the copper pipe. Plastic pipe has a larger outside diameter than copper pipe of the same nominal dimension, it is expected to not match up evenly. However, this results in water remaining in the bottom of the plastic pipe and over time will leave a residue buildup in the pipe. Additionally, the pumped kitchen sink line is discharging right at this misalignment, which will impact the flow, resulting in back pressure (water flowing back up the drain towards the tub). I would remove more of the copper line and replace it with plastic, moving the transition downstream of...

Full answer by pdd: https://diy.stackexchange.com/a/312312 (CC BY-SA 4.0).

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