After raising the floor and tiling the original waste line and toilet flange is well below the top of the new floor surface. Home depot told me to use some 1/4" souix chief flange extenders / spacers. Stack them up and use silicon in between to seal them. The toilet bolts go on one of the layers and I guess I need to fill the gap that makes with more silicon. The issue I have now is that the original metal flange is still on the waste line. It is my understanding you screw the spacers to the subfloor to secure them but the metal flange is in the way. Not sure of I need to remove it or screw through them. Any advice?
You need a "Set-Rite Flange Extender Kit" This can solve the entire problem. I believe in US they are available in Lowes, Menards and Ace Hardware. In Canada harder to find. Best bet is a larger RONA store or an ACE Hardware if you can still find one. See this site < https://set-rite.com/frequently-asked-questions/ >