Connecting UPVC soil pipe into existing cast iron stack

[GuinnessMK]

What do I use to seal / join the two?

The cast iron stack has shoes every 4', into which slots the next section of pipe, sealed with a ring of mortar around it. I'm thinking break out the mortar, remove the cast sections above the shoe, then put the new UPVC pipe into the socket in the shoe. Do I seal that with mortar / silicone / PU sealant (have some left over from another job!).

Cheers

[Wings]

If you think of the washer that connects into the toilet pan and on to the sewage pipe, then the same type of washer is used to reduce/seal clay to plastic drainage pipes, as per link;

http://www.burdens.co.uk/depot/stockton-tees

[sleep envy]

does it have to be a UPVC pipe?

St Gobain do a pipe called Timesaver for which you can buy the pieces which mate cast iron to their product - looks loads neater and saves you mucking about with mastics/mortar

[Ferg]

You should really do it with a drain connector, which is like a single socket, but has a small flange on the bottom. Seal with Plumbers Mait.

[GuinnessMK]

All done. Quick phone call to the merchant this morning found the correct black plastic adaptor with a seal made by the rubber fins.

Picked that up on the way to collect the scaffold tower. Old cast iron cut back with angry grinder, new UPVC from the new ensuite extended and connected into the existing cast stack. All done, mortared up, tested and water proof!

Thanks!

[Ferg]

GuinnessMK said:

All done. Quick phone call to the merchant this morning found the correct black plastic adaptor with a seal made by the rubber fins.

Eh? That sounds like it's internal to the cast iron....or was it into a socket?

[GuinnessMK]

The cast iron was in sections, at the top of each section is the bracket which attaches to the wall.

Cut the cast pipe down to the bracket, cut / hammered / drilled the pipe and mortar out of the socket. Cleaned it out, pushed the plastic / rubber adaptor in, which looks like a WC connector but in black :-



Fecking hope that is right, fed up of being up that tower!