Peter wrote:
I am about to connect 4 inch waste from a new attic conversion to an
external cast iron one. Currently it rises to above roof level. Some
questions:-

As my angle grinder wont cut thro 4 inches should I cut twice ie make a sort
of inspection hole and hacksaw the back or is there an easier way. (for
direct connection at attic floor level)
Should I replace all to ground level or to existing 1st floor connections.
Will new plastic fit inside old cast iron joints.

If you can separate it at a joint, then it is easy enough to put plastic
into an old cast iron collar.

--
Cheers,

John.

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