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The tee is at the top of the pic. The new vanity is floating which is why it is cut and moved up where I am holding it. So that is why I need 90s to get it to the drain which would be centered in the vanity. I could move it so it is the sanitary tee, vertical drop, 45, travel, 45 and into the...

I have an upstairs bathroom sink that needs to drain to the basement below. I can't simply run the drain vertically down through the wall because there are joists in the way. We have a floating vanity and don't want the drain to drop out from the bottom of the vanity. So it needs to bump out...

I assume putting drywall would be the same as metal and a non combustable layer. In the attic I just saw it actually says Type R in several places. Unsure what this means. Running copper would solve the Pex issue, but ideally I still have the vent from the sink below up there. Unfortunately...

What if I took sheet metal to incase the flue kind of what they did where the flue comes through the basement floor and enters the boiler? I am also not opposed to running copper. I am confident in my skills to sweat pipe, but the copper is right against the floor joist and subfloor below. It...

My understanding is 6” horizontally is required. I have a doubled wall flue so I believe this means it is a type B. Does that mean a pvc vent and PEX can be located more like 3” away? I have read but can't really verify that you can put pipe closer to type B.

So is there anything else I can do to try and solve this mystery so I can confidently connect the bathroom sink into this pipe? Or am I out of luck? Thanks again for helping to problem solve this.

It looks like it is starting to slope where the water is, like as if I was looking at a trap. No, the utility sink has been hooked up to it for 6-7yrs and no issues of clogging. It is a metal pipe going into the slab and the top looks like it was cut at some point before the ABS was put in...

Well, it is near impossible to hear down the pipe since all the noise of the water rushing down the stack over powers it. But, I can see there is standing water at the bottom of the pipe going into the slab. So I would guess a trap because when I pour water down the open pipe, there suddenly is...

The boiler T&P drains into the pipe that you see going upstream. Then both run into the slab in the NSF pic previously posted. I also looked back at the video when we had the line inspected before buying the house. Right at 4ft inside the line leaving the house, you do see a pipe coming into the...

And I assume there isn't an easy way to make sure the original pipe is connected to sanitary? It is a 1949 home and the basement was finished in 2000, which I am guessing when they made the current setup.

Ok, so I am clear. You would feel comfortable draining the sink into the current black pipe? If so, would this diagram be correct? I am unsure how the new trap needs to get vented. Would this make sense as long as I am 6" above the sink? If I opted for AAV, I can vent both of them to this...

Thanks for the info. I am nervous that the black pipe doesn't actually drain into my main line and obviously don't want to add to the problem if that is the case. As I mentioned, there has never been smell even without a trap. I don't know if images will help, but here is how the layout look. I...

There is a gap, it is just a bad angle. The copper stops short of the top of the black pipe.

I guess that is a question that I have now since there isn't a trap on that and yet there hasn't been any smell over the years. Why would that be? That drain pipe runs for about 8 feet past the main stack by about two feet and then drops into the slab. On the other side of the wall is the floor...

I have a Saniflo toilet in our basement and the bathroom sink is tied into it. I would like to change the drain pipe from the sink to drain into the existing plumbing so it doesn't drain into the toilet, which causes the toilet to flush often. Originally it was plumbed this way because Saniflo...