But if your floor is severely rotted say more than an inch beyond the flange you re stuck replacing the flooring around the toilet.
Installing toilet flange on wood floor.
Next install a new wax ring.
Rest the toilet bowl on its side place it on a towel or cloth to protect the floor and attach the replacement wax ring to the bottom of the bowl this technique helps ensure the ring is in the proper position when placing the toilet over the flange.
In this video i demonstrate a simple and permanent method of installing a toilet where the new tile floor was installed over the original subfloor but the to.
It goes under the flange and transfers the load of the flange and toilet and you out onto more solid surrounding wood.