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The crawl space under my home is partitioned into two sections by a chain wall topped with a concrete block knee wall to the floor joists. According to plumbing/building codes, may I run a DWV line (3" from a kitchen group) through the roughly 3' wide passageway between the two crawl space...

Ball and Terry, I am grateful for both perspectives on my predicament. Thanks for taking the time to respond. I'll reassess the situation and re-post if any alternatives emerge. But first I'm going to calculate the drop my turds will be experiencing from about 9.5 feet; they probably won't...

Thanks Terry and hj. That is what my limited understanding of plumbing led me to believe. However, I thought it worth the risk of asking since 'inaccessible' in this sense means 18" of heavily reinforced 5,000 psi concrete. Neither my bank account nor my back is quite prepared for that...

Several factors are confounding my desire to add a partial bath on the second floor above a partial bath in my utility room. The main drain and toilet branch on the first floor are not accessible through the floor, eliminating the addition of an independent vent for the toilet. I don't suppose...