Originally Posted by
ballengerb1
They have their own code so its up to you to read.
http://www.phillyriverinfo.org/WICLi...umbingCode.pdf 3" or 4" is fine, use 3" most of the time to get into tight spaces. You must vent all of the fixtures in your new bath not just the toilet. Is there a stack in the basement now that you can tap?
Thanks very much for your reply.
I had read the code and found it hard to interpret (or maybe I just didn't like what I was seeing) so I was looking for some local knowledge. Here is the (I believe) relevant passage:
[Plumbing Code Excerpt]
P-902.2 Underground sanitary drains. Underground building sanitary drainage within a building and beyond the building wall to the street, including site work, shall conform to one of the materials and standards listed in Table P-902.2.
Drainage systems for corrosive industrial wastes shall be of acid-resisting cast iron or other material that is
resistant to corrosion and degradation for the concentrations of chemicals involved.
TABLE P-902.2 — UNDERGROUND SANITARY DRAINAGE PIPE MATERIAL STANDARD
- Cast iron pipe ASTM A 74; CISPI 301
- Concrete pipe a ASTM C 14; ASTM C 76; CSA A 257.1; CSA A 257.2
- Copper or copper-alloy tubing (Type K or L) ASTM B 75: ASTM B 88: ASTM B 251
- Ductile iron AWWA C 151
- Vitrified clay pipe a ASTM C 4; ASTM C 700
Note a: Not permitted underground within buildings nor within 10 feet of the building foundation.
[End Plumbing Code]
So now I am thinking that the way to go may be either to put in a cast iron wye with a 3" copper run to the toilet? Or instead of the wye perhaps some sort of saddle into the cast iron. Is that even reasonable?
I will vent every fixture the same way. I did not mean to imply that I would vent some fixtures and not others. I was just hoping that there was not a requirement because of this Philadelphia Single Stack configuration I've heard about.
To answer your question about there being a stack in the basement into which I could tap, is not so simple. I can see the bottom of the stack (and a clean out hole) but it does not go directly into the slab. Rather there is a 90 degree elbow and it is buried in a cinder-block / stucco knee high wall. The basement is actually a split level hence the knee high wall. The stack comes down and lands right between the two levels. I should also mention that the stack sits in a corner behind the furnace, so getting to it is no easy task in itself. I should mention that there is already a half bath on the upper level of the basement that I plan to remove. If I knew how all the pipes were laid out there is a chance that I could tap into the drain for the existing toilet. That drain is on the other end of the knee-high wall from the stack. I pulled that toilet off to see which way the closet bend goes and it turns toward the stack (see attachment). I am guessing that the stack and that toilet meet somewhere in the middle and connect to the horizontal drain out to the sewer.
I have attached a picture of the stack in the knee high cinder-block wall.
I appreciate all useful thoughts and advice. Sorry for such a long post. Again thanks for your input.