Adding a bathroom in the attic, deciphering the current plumbing
I am adding a bathroom in my attic, and when I opened up the wall it looked like the plumbing was already set for a bathroom, including a separate vent line and 2 capped off copper water lines (see picture). The fittings on the waste line are too high, but I am wondering if anyone could tell me if I can cut the line low enough and tie in a PVC Y for all my plumbing. Will someone with years of plumbing experience please give me some advice! Thanks
I am also wondering about the two copper water lines. They are not live, and since that was put in the entire plumbing system in the house has been redone with pex. I am wondering if I could save myself sometime and try to find the bottom of those lines and tie into them? How would I go about finding the other ends? Or maybe it would be better to just run new pex all the way up myself? Let me know what you think.
Where to tie in the drain?
I have actually cut into CI before and tied in a Y for a washer and dryer drain. I think I will be able to do the same here without too much trouble, I just use a angle grinder and saw right through it.
What I am wondering is, do I need to tie in my PVC Y just below the floor, so its lower than my toilet and shower drain, or do I need to run my pipe down below the 2nd level fixtures? From my understanding what I need to know is how the 2nd level toilet is vented, and if it is vented separate from the drain stack then I can tie in just below the floor, but if it is vented just from the main stack then I need to go lower. Is this understanding correct? Is there a way to know how the 2nd level toilet is vented without tearing up my wall and floor?
Thanks for the help.
Going with the assumption
Would it be safe to just go with the assumption and tie it in under the attic floor. What would happen if the toilet wasnt properly vented and my assumption was wrong. Would it just go against code, or would it not function properly?
Would you tear into the wall to look at the pipes?
dont let it get away from you
Originally Posted by zaothusia
probably the best thing to do is simply cut that out below
your bathroom and cut it out above that tee...
i would gamble on it being plumbed correctly becasue
back in those days they did not install cast to a third floor without it being right.....
if you do decide to cut all that out, jsut be careful
you will be playng with about 250- 350 lbs dangling
above you and your ladder....
I would guess that double wye and cross alone is well over 75 lbs...
you really dont want to let that "free fall" unless you dont care
about what gets damaged....