connecting plastic to cast iron stack

[Fredstudio]

They I wanting to renew my cast iron stack in plastic from the first socket on it. I wonderd if I could put 4inch plastic pipe into the top of the cast iron socket then put plumbers mate around this will this seal ok. Thanks for any suggestions

 

[rojaca]

Don't think there is an approved way of doing this. Have used some hempwhich I have tamped into the socket and then finished with an external black mastic sealant.

Am now waiting to be shot down in flames...

 

[rojaca]

mmm... "hempwhiches". Bit like space-cakes and disco-biscuits.

 

[Fredstudio]

Thanks for advice. Did it hold ok with hemp and black mastic sealant?

 

[rojaca]

As far as I know... At least until I was around the corner anyway