I am adding a kitchen sink to a basement and want to run the sink drain through a hollow stud wall to reach the existing soil stack. My concern is it is 17' away and requires seven 90-degree elbows. Yes, seven. I know it's crazy, but this is what I have to work with. There is a pillar in the way which can't be moved, and I don't see any other options besides cutting a long trench in the concrete from the sink to the stack in the bathroom, which I really don't want to do. Three questions:
1) Is this feasible?
2) Will it pass inspection?
3) Do I need a vent near the kitchen sink or will the stack in the bathroom serve as an adequate vent?
Best Answer
Drilling holes in 17 feet of studs to accommodate a 1 1/2 inch drain line would not be recommended. The sheer number of studs impacted, including two corners, would definitely weaken the wall, especially if it is a exterior load bearing wall.
A second consideration with what is shown in your picture is that if it ever plugged it would be impossible to run a snake through such piping construction.
It is common to organize the house layout so that the plumbing routing is optimized and clustered into one particular area. This way you avoid much of what you are proposing. You may want to seriously consider just where you plan to put this kitchen sink and drains.