I'm installing a new bathroom floor, which will raise the floor level about 1 inch. I haven't removed the WC yet, but I'm assuming that the drain is lead with a closet ring mounted to the wood floor.
(There's no way I'm replacing the lead drain.) What is the best way to raise the drain here? I would expect that I could mount a new ring on the floor, but what should I use to seal around the new subfloor/mortar & tile? (Or does it need to be sealed?)
I have seen closet flanges with a rubber extension - I could insert one - but does the rubber need to be bonded to the (lead) waste pipe? Or can it just fit inside?