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As I understand it, code (at least IPC) specifies vents must slope to drain, to prevent condensation from accumulating, but it doesn't care if it slopes toward the fixture drain or toward a vent stack that slopes back to drain, as long as there aren't traps, and it slopes all the way to drain...

Following the IPC, Lav = 1 DFU, and using Table 710.1(1): 1-1/2 drain @ 1/4in takes max 3 DFU, whereas 2in @ 1/4 slope takes 21 DFU max. I know greatly oversized pipes are more likely to clog.. but 2 isn't greatly oversized from 1-1/2. So which is statistically less likely to clog? The...

I have a 3in building drain running about 6in or so above grade in a tall crawlspace. The floor joists are 3-1/2 feet above the pipe. What's the best way to support the drain? I was considering using concrete blocks every 4', but I'm wondering if there's a chance the ground may settle...

I'm roughing in a tub, and have a schedule 40 waste & overflow assembly. The bathroom sits above a tall conditioned crawlspace, and I thought using a trap with slip joints would give the homeowner the option of clearing the trap if it ever needs it. I have a sched40 union trap like this...