I am in the process of renovating the pantry in my CIRCA 1860 home. While tearing out the deteriorated plaster and lath, I exposed the plumbing for the upstairs bathroom as well as that for the pantry. None of the existing units are vented, and I wanted to see about upgrading the system.
Here is what I have:
Upstairs (and currently accessible from beneath the floor) I have a sink with an S-trap and a tub. The sink waste line (after the trap) drops through the floor then takes a 90degree turn into a 1.25‚Äù lead waste line. That line disappears from view through adjoining floor joists, but I presume it meets up with the main waste vent stack several feet away. The tub is similarly plumbed into a 1.25‚Äù lead horizontal waste line, but at some point the original trap was replaced with a drum trap. Both of these fixtures recently required snaking to improve performance, but both are currently working well. The tub is only used for showering, so I don‚Äôt know if siphoning would be a problem. The sink does not appear to siphon even when filled and drained all at once.
Downstairs in the pantry, and directly below the two upstairs fixtures, I have a waste line for a clothes washer and plan to add another for a sink. The washer line is not vented and drops through the floor for an in-basement p-trap connected to another part of the waste line.
My questions are:
1- How might I upgrade some or all of the fixtures (downstairs lavatory and washer, and upstairs lavatory and tub) to a venting system?
2- If the fixtures are working fine now, is this necessarily advisable?
3- Are the existing lead waste lines a problem?
1- Further tear-out upstairs is out of the question.
2- I do not have access to the main waste/vent stack on the second floor. It is buried deep behind chimneys and complicated wall partitions. If I abandon the lead lines, they will need to be plugged and left in place for the foreseeable future.
3- I believe the s-trap on the upstairs lavatory has to stay. The sink is on an exterior wall, which is filled with vermiculite insulation. I suppose I could run the ‚Äútailstock‚Äù as a strait shot through floor and put a p-trap below the floor, however.
1- Could I use the existing lead waste lines as vents? They are obviously lower than the flood stage of the lavatory and tub they serve, but could I resolve this issue by installing a check valve? I can easily lower the outlet of the tub trap by as much as 18‚Äù below the current waste line (made of lead). I could do the same for the sink if I wanted to use a really long tail stock and put the trap below the floor.
2- What about vents made for inside applications like the Studor Air Admittance Valve? The ones that act like a check valve for air, allowing it into the vent, but not out? Are they safe and reliable? Would you ever consider building them into a wall where they can‚Äôt easily be serviced? Might they at least be used for the downstairs fixtures?
Thanks for any ideas you might suggest.
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