So my plumbing is easily accessible in the basement (one story house) but it's a complete mess down there. Galvanized pipe connected to ABS connected to PVC, sometimes there's even some cast iron in there. A lot of the pipe isn't even graded properly. I've got some mystery pipes that don't seem to be connected to anything (or they might be the gutter downspouts); I've got an endoscope coming so I could figure out what's going on with those. But anyhow,

I did a drawing in SketchUp for my proposed layout; the current plumbing runs around the perimeter of the house in the opposite direction where it connects to a sewer main that's 4' above the floor. The grading is all wrong. I've also got a vent stack on the roof, but none of the plumbing seems to be connected to it, the current system is basically running with an AAV in the basement and that's it. Hopefully my drawing below explains what I want to do, the house is relatively small and it's easy enough to replace the majority of the pipes with PVC. I was also going to install a utility sink downstairs so that I could have a washer draining into it (so it goes without saying that utility sink pipe would have the necessary valves on it even though they're not on the drawing same thing with plumbing stack going to the bathroom, most of that is PVC and hooked up properly)

The plumbing currently looks like this:

[imgur.com]

My proposed layout is as follows:

Isometric: [imgur.com]
From above: [imgur.com]

If anyone could provide some input that'd be greatly appreciated.

nice drawing ..

but the traps along with how each one is protected from syphoning is just as important as the drain layout.

you don't show any of that.

I've got a diagram of what the plan for the kitchen is maybe it's not showing well in the diagram but basically it'd be this:
[imgur.com]

The pipe coming from the bathroom I'm not touching at all, that's staying as is.



Edited 2 times.

I would run that kitchen waste around the outside of the basement instead creating a head banger in the middle. I would run a proper vent to the kitchen. If you're installing an ejector pit for the utility sink it will need a vent too.

The everbilt 1/3 HP pump doesn't need a vent from my understanding (the pump itself isn't vented).

Also that's how the current drain runs (opposite side). The problem is that there's an electrical panel on that wall so everything basically drops down to the same height as the main drain on the other side of the house, which is partly what's causing the bad grading. Sucks cause I can't go around either way, one side has the electrical box, the other side has the garage door.



Edited 1 times.

? move the electric panel ?

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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

Not as easy to move the panel since the service run is above ground. Dead-end road so to get it to the other side of the house would require getting another pole and probably chopping down a few trees (which is a completely different problem here).