Connecting to cast iron vent stack

[imarsh]

Before I take it all down to see, is it likely I'll be able to connect into my cast iron vent stack. The house is victorian & the stack has had no connections into it previously (above ground). I was planning on removing the whole stack and replacing it with plastic. i'm moving the bathroom upstairs from the ground floor where it currently is so will need to connect the toilet to it. I'm a bit concerned that as it is currently only a vent stack it may be constructed differently.

Thanks

 

[kevplumb]

if its meant to be a "dry leg" the labc wont like it