>>2912941
>someone bought the fancier wax ring and then installed it upside down
>plumber told you the fix for this was to fucking replumb the whole thing
ya know why he said that? because its a $5 30 minute fix.

also, if the tiles are spongy... only time Ive seen that before is if some fucking brainiac used mastic for floor tiles. the shit turns to jelly when wet. Bonus here though is if thats the case removing rhe old tiles will be easy.