We are installing a basement shower which will require connecting pvc to under concrete cast iron. The shower will be 5' away from vent stack. Will additional venting need to be installed? What is the BEST method to accomplish this, and what connectors should be used?

The way its done hear is s rubber coupling with a full metal band around it and then stainless steal clamps to tighten the metal band to compress the rubber fitting. On the cast side a black sealant is used to fill up the imperfections on the outside ruff texture of the cast. The P.V.C. can be coated to at that connection.
Yes additional venting will be required if you want to shower to drain. I don't know your codes and what the accept for connection only your pluming/building inspector can make the call.

Hey kvilesus:

21Boat is referring you to a SHIELDED clamp... see picture below. These clamps are made to accommodate the difference between the two different pipe types... in this case, PVC and cast iron. Shielded clamps are available at most home supply stores.

The black sealant he referred to is not a common practice anywhere that I know of, but all states have different codes/requirements and plumbing practices so certainly not questioning the validity of fact that it is required in his area, but I will suggest that you will not need to use the stuff for just one joint/transition... ok?

In terms of venting, if the vent is within 5 feet of the shower drain and there is no other fixture discharging into the pipe you may not need to add another vent here... hard to say without a picture or more info...

Let us know more...

MARK

Massplumber 2008 it is required on our connections of cast no hub couplings also a fernco can't be on a horizontal supported waste line I guess the city and for good reasons doesn't like a dry fit over cast especially if it's a bit rusted and it can leak without filling up the pitting on the cast. I know I keep saying this my town Lanc Pa 1754 and tons of old plumbing. Still lead bends and drum traps for tubs around.

Like I said 21 Boat, "certainly not questioning the validity of fact that it is required in his area"... but not required in most places I've worked in and you did not give a name for the sealant or a place to pick it up?

And in my area, ferncos (see picture) are not supposed to be used anywhere above ground. They are strictly to be used for underground applications.

Let us know more... ;)

I just saw you revised your post....what is this sealant you use? We have some pretty old plumbing here (Boston)... ;)... no sealants needed? Let me know will you. Thanks...

MARK