I have a guest bathroom with the sink not draining (the tub/shower are on the horizontal/lateral run of drain pipe as the sink, and the sink is downstream of the tub (as you can tell by my terminology, I am not a plumber).
Anyway, the tub drains fine, but the sink won't (I have removed the trap and hand snaked the drain, but it stops dead about where the 2" vertical drain pipe meets the lateral. Now I know the lateral pipe is clear as the tub drains through it fine.
I went to the roof and tried hand snaking the vent pipe (which is the vertical line for the sink) and it too stops dead about where it joins the lateral. I ran a hose in the roof vent, and the water backed up in the sink, so it would appear the blockage has to be below the sink inlet into the vertical pipe, but above the lateral line.
Now here is my puzzle -- the sink has a strainer on it which would prevent any large object from going down the drain.
It is a 70 year-old house with iron and galvanized drain pipe in this section of the house.
Is it possible that it just rusted closed, or is it possible for a squirrel to have dropped a nut or something down the vent pipe and it lodged in the pipe (I do have squirrels on the roof as they jump to and from my avocado tree?
The tool rental store is closed today, but my thinking is to rent a 2" snake with a cutter head and feed it down from the roof, but I have a clay tile roof, and I hate to drag any equipment up there and break the tiles. It is a tight fit to try and snake from the sink as it is a pedestal sink grouted to the tile floor, and I hate to disturb all that.
There is no good way to snake up from the lateral drain pipe, but I suppose I could try drilling the junction directly below where the vertical pipe joins it, and snake from below (pretty heavy iron "T" junction there to drill through, though)
Well, I would appreciate any advice you may have (maybe I just should call a plumber, but I normally am a handy guy and do my own plumbing, electrical, carpentry, etc.).
best,
doug